path: root/plugins/ethercat/packet-ethercat-datagram.c

/* packet-ethercat-datagram.c
 * Routines for ethercat packet disassembly
 *
 * $Id$
 *
 * Copyright (c) 2007 by Beckhoff Automation GmbH
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/* Include files */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <glib.h>

#include <epan/packet.h>

#include "packet-ethercat-datagram.h"
#include "packet-ecatmb.h"

static heur_dissector_list_t heur_subdissector_list;
static dissector_handle_t ecat_mailbox_handle;

/* Define the EtherCAT proto */
static int proto_ecat_datagram = -1;

/* Define the tree for EtherCAT */
static int ett_ecat = -1;
static int ett_ecat_header = -1;
static int ett_ecat_syncman = -1;
static int ett_ecat_syncflag = -1;
static int ett_ecat_fmmu = -1;
static int ett_ecat_fmmu_type = -1;
static int ett_ecat_fmmu_active = -1;
static int ett_ecat_dc = -1;
static int ett_ecat_length = -1;
static int ett_ecat_padding = -1;
static int ett_ecat_datagram_subtree = -1;

static int hf_ecat_sub;
static int hf_ecat_sub_data[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_cmd[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_idx[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_cnt[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_ado[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_adp[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_lad[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};

static int hf_ecat_header = -1;
static int hf_ecat_data = -1;
static int hf_ecat_cnt = -1;
static int hf_ecat_cmd = -1;
static int hf_ecat_idx = -1;
static int hf_ecat_adp = -1;
static int hf_ecat_ado = -1;
static int hf_ecat_lad = -1;
static int hf_ecat_len = -1;
static int hf_ecat_int = -1;
static int hf_ecat_syncman = -1;
static int hf_ecat_syncman_start = -1;
static int hf_ecat_syncman_len = -1;
static int hf_ecat_syncman_flags = -1;
static int hf_ecat_syncman_flag0 = -1;
static int hf_ecat_syncman_flag1 = -1;
static int hf_ecat_syncman_flag2 = -1;
static int hf_ecat_syncman_flag4 = -1;
static int hf_ecat_syncman_flag5 = -1;
static int hf_ecat_syncman_flag8 = -1;
static int hf_ecat_syncman_flag9 = -1;
static int hf_ecat_syncman_flag10 = -1;
static int hf_ecat_syncman_flag11 = -1;
static int hf_ecat_syncman_flag12 = -1;
static int hf_ecat_syncman_flag13 = -1;
static int hf_ecat_syncman_flag16 = -1;
static int hf_ecat_fmmu = -1;
static int hf_ecat_fmmu_lstart = -1;
static int hf_ecat_fmmu_llen = -1;
static int hf_ecat_fmmu_lstartbit = -1;
static int hf_ecat_fmmu_lendbit = -1;
static int hf_ecat_fmmu_pstart = -1;
static int hf_ecat_fmmu_pstartbit = -1;
static int hf_ecat_fmmu_type = -1;
static int hf_ecat_fmmu_typeread = -1;
static int hf_ecat_fmmu_typewrite = -1;
static int hf_ecat_fmmu_active = -1;
static int hf_ecat_fmmu_active0 = -1;

static int hf_ecat_sub_dc_diff_da[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_dc_diff_bd[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_dc_diff_cb[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_dc_diff_cd[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_dc_diff_ba[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
static int hf_ecat_sub_dc_diff_ca[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};

static int hf_ecat_dc_diff_da = -1;
static int hf_ecat_dc_diff_bd = -1;
static int hf_ecat_dc_diff_cb = -1;
static int hf_ecat_dc_diff_cd = -1;
static int hf_ecat_dc_diff_ba = -1;
static int hf_ecat_dc_diff_ca = -1;

static int hf_ecat_length_len = -1;
static int hf_ecat_length_r = -1;
static int hf_ecat_length_c = -1;
static int hf_ecat_length_m = -1;

static int hf_ecat_padding = -1;

static const value_string EcCmdShort[] =
{
   {   0, "NOP" },
   {   1, "APRD" },
   {   2, "APWR" },
   {   3, "APRW" },
   {   4, "FPRD" },
   {   5, "FPWR" },
   {   6, "FPRW" },
   {   7, "BRD" },
   {   8, "BWR" },
   {   9, "BRW" },
   {   10, "LRD" },
   {   11, "LWR" },
   {   12, "LRW" },
   {   13, "ARMW" },
   {   14, "FRMW" },
   {   255, "EXT" },
   {   0, NULL }
};

static const value_string EcCmdLong[] =
{
   {   0, "No operation" },
   {   1, "Auto Increment Physical Read" },
   {   2, "Auto Increment Physical Write" },
   {   3, "Auto Increment Physical ReadWrite" },
   {   4, "Configured address Physical Read" },
   {   5, "Configured address Physical Write" },
   {   6, "Configured address Physical ReadWrite" },
   {   7, "Broadcast Read" },
   {   8, "Broadcast Write" },
   {   9, "Broadcast ReadWrite" },
   {   10, "Logical Read" },
   {   11, "Logical Write" },
   {   12, "Logical ReadWrite" },
   {   13, "Auto Increment Physical Read Multiple Write" },
   {   14, "Configured Address Physical Read Multiple Write" },
   {   255, "EXT" },
   {   0, NULL }
};

static const value_string ecat_subframe_reserved_vals[] =
{
   { 0, "Valid"},
   { 0, NULL}
};

static const value_string ecat_subframe_circulating_vals[] =
{
   { 0, "Frame is not circulating" },
   { 1, "Frame has circulated once" },
   { 0, NULL }
};

static const value_string ecat_subframe_more_vals[] =
{
   { 0, "Last EtherCAT datagram"},
   { 1, "More EtherCAT datagrams will follow"},
   { 0, NULL}
};

static const true_false_string tfs_ecat_fmmu_typeread =
{
   "Read in use", "Read ignore"
};

static const true_false_string tfs_ecat_fmmu_typewrite =
{
   "Write in use", "Write ignore"
};

static const true_false_string tfs_ecat_fmmu_active =
{
   "Enabled", "Disabled"
};

static const true_false_string tfs_ecat_syncman_flag0 =
{
   "OPMODE xx", "OPMODE xx"
};

static const true_false_string tfs_ecat_syncman_flag1 =
{
   "00: 3-Buf, 01: 3-Buf (Mon.), 10: 1-Buf", "00: 3-Buf, 01: 3-Buf (Mon.), 10: 1-Buf",
};

static const true_false_string tfs_ecat_syncman_flag2 =
{
   "Write", "Read"
};

static const true_false_string tfs_ecat_syncman_flag4 =
{
   "IRQ ECAT enabled", "IRQ ECAT disabled"
};

static const true_false_string tfs_ecat_syncman_flag5 =
{
   "IRQ PDI enabled", "IRQ PDI disabled"
};

static const true_false_string tfs_ecat_syncman_flag8 =
{
   "IRQ Write 1", "IRQ Write 0"
};

static const true_false_string tfs_ecat_syncman_flag9 =
{
   "IRQ Read 1", "IRQ Read 0"
};

static const true_false_string tfs_ecat_syncman_flag10 =
{
   "Watchdog", "No Watchdog"
};

static const true_false_string tfs_ecat_syncman_flag11 =
{
   "1-Buf written", "1-Buf read"
};

static const true_false_string tfs_ecat_syncman_flag12 =
{
   "Buffer Status xx", "Buffer Status xx"
};

static const true_false_string tfs_ecat_syncman_flag13 =
{
   "00: 1.Buf, 01: 2.Buf, 10: 3.Buf", "00: 1.Buf, 01: 2.Buf, 10: 3.Buf"
};

static const true_false_string tfs_ecat_syncman_flag16 =
{
   "SyncMan enabled", "SyncMan disabled",
};

static const char* convertEcCmdToText(int cmd, const value_string ec_cmd[])
{
   return val_to_str(cmd, ec_cmd, "<UNKNOWN: %d>");
}

#define ENDOF(p) ((p)+1) /* pointer to end of *p*/

typedef enum
{
   EC_CMD_TYPE_NOP  = 0,
   EC_CMD_TYPE_APRD = 1,
   EC_CMD_TYPE_APWR = 2,
   EC_CMD_TYPE_APRW = 3,
   EC_CMD_TYPE_FPRD = 4,
   EC_CMD_TYPE_FPWR = 5,
   EC_CMD_TYPE_FPRW = 6,
   EC_CMD_TYPE_BRD  = 7,
   EC_CMD_TYPE_BWR  = 8,
   EC_CMD_TYPE_BRW  = 9,
   EC_CMD_TYPE_LRD  = 10,
   EC_CMD_TYPE_LWR  = 11,
   EC_CMD_TYPE_LRW  = 12,
   EC_CMD_TYPE_ARMW = 13,
   EC_CMD_TYPE_FRMW = 14,
   EC_CMD_TYPE_EXT  = 255
} EC_CMD_TYPE;

static void init_EcParserHDR(EcParserHDR* pHdr, tvbuff_t *tvb, gint offset)
{
   pHdr->cmd = tvb_get_guint8(tvb, offset++);
   pHdr->idx = tvb_get_guint8(tvb, offset++);
   pHdr->anAddrUnion.a.adp = tvb_get_letohs(tvb, offset); offset+=sizeof(guint16);
   pHdr->anAddrUnion.a.ado = tvb_get_letohs(tvb, offset); offset+=sizeof(guint16);
   pHdr->len = tvb_get_letohs(tvb, offset); offset+=sizeof(guint16);
   pHdr->intr = tvb_get_letohs(tvb, offset);
}

static void init_dc_measure(guint32* pDC, tvbuff_t *tvb, gint offset)
{
   int i;
   for ( i=0; i<4; i++ )
   {
      pDC[i] = tvb_get_letohl(tvb, offset);
      offset+=sizeof(guint32);
   }
}

static guint16 get_wc(EcParserHDR* pHdr, tvbuff_t *tvb, gint offset)
{
   return tvb_get_letohs(tvb, offset+EcParserHDR_Len+(pHdr->len&0x07ff));
}

static guint16 get_cmd_len(EcParserHDR* pHdr)
{
   return (EcParserHDR_Len+(pHdr->len&0x07ff)+sizeof(guint16)); /*Header + data + wc*/
}


static void EcSummaryFormater(guint32 datalength, tvbuff_t *tvb, gint offset, char *szText, gint nMax)
{
   guint nSub=0;
   guint nLen=0;
   guint8  nCmds[4];
   guint nLens[4];
   EcParserHDR ecFirst;
   EcParserHDR ecParser;

   guint suboffset=0;

   init_EcParserHDR(&ecFirst, tvb, offset);

   while ( suboffset < datalength )
   {
      PEcParserHDR pEcParser;
      if ( nSub > 0 )
      {
         init_EcParserHDR(&ecParser, tvb, offset+suboffset);
         pEcParser = &ecParser;
      }
      else
         pEcParser = &ecFirst;

      if ( nSub < 4 )
      {
         nCmds[nSub] = pEcParser->cmd;
         nLens[nSub] = pEcParser->len&0x07ff;
      }
      nSub++;
      nLen += (pEcParser->len&0x07ff);
      /* bit 14 -- roundtrip */

      if ( (pEcParser->len&0x8000) == 0 )
         break;

      suboffset+=get_cmd_len(pEcParser);
   }
   if ( nSub == 1 )
   {
      guint16 len = ecFirst.len&0x07ff;
      guint16 cnt = get_wc(&ecFirst, tvb, offset);
      g_snprintf ( szText, nMax, "'%s': Len: %d, Adp 0x%x, Ado 0x%x, Wc %d ",
         convertEcCmdToText(ecFirst.cmd, EcCmdShort), len, ecFirst.anAddrUnion.a.adp, ecFirst.anAddrUnion.a.ado, cnt );
   }
   else if ( nSub == 2 )
   {
      g_snprintf ( szText, nMax, "%d Cmds, '%s': len %d, '%s': len %d ",
         nSub, convertEcCmdToText(nCmds[0], EcCmdShort), nLens[0], convertEcCmdToText(nCmds[1], EcCmdShort), nLens[1]);
   }
   else if ( nSub == 3 )
   {
      g_snprintf ( szText, nMax, "%d Cmds, '%s': len %d, '%s': len %d, '%s': len %d",
         nSub, convertEcCmdToText(nCmds[0], EcCmdShort), nLens[0], convertEcCmdToText(nCmds[1], EcCmdShort), nLens[1], convertEcCmdToText(nCmds[2], EcCmdShort), nLens[2]);
   }
   else if ( nSub == 4 )
   {
      g_snprintf ( szText, nMax, "%d Cmds, '%s': len %d, '%s': len %d, '%s': len %d, '%s': len %d",
         nSub, convertEcCmdToText(nCmds[0], EcCmdShort), nLens[0], convertEcCmdToText(nCmds[1], EcCmdShort), nLens[1], convertEcCmdToText(nCmds[2], EcCmdShort), nLens[2], convertEcCmdToText(nCmds[3], EcCmdShort), nLens[3]);
   }
   else
      g_snprintf ( szText, nMax, "%d Cmds, SumLen %d, '%s'... ",
         nSub, nLen, convertEcCmdToText(ecFirst.cmd, EcCmdShort));
}

static void EcCmdFormatter(guint8 cmd, char *szText, gint nMax)
{
   gint idx=0;
   const gchar *szCmd = match_strval_idx((guint32)cmd, EcCmdLong, &idx);

   if ( idx != -1 )
      g_snprintf(szText, nMax, "Cmd        : %d (%s)", cmd, szCmd);
   else
      g_snprintf(szText, nMax, "Cmd        : %d (Unknown command)", cmd);
}


static void EcSubFormatter(tvbuff_t *tvb, gint offset, char *szText, gint nMax)
{
   EcParserHDR ecParser;
   guint16 len, cnt;

   init_EcParserHDR(&ecParser, tvb, offset);
   len = ecParser.len&0x07ff;
   cnt = get_wc(&ecParser, tvb, offset);

   switch ( ecParser.cmd )
   {
   case EC_CMD_TYPE_NOP:
   case EC_CMD_TYPE_APRD:
   case EC_CMD_TYPE_APWR:
   case EC_CMD_TYPE_APRW:
   case EC_CMD_TYPE_FPRD:
   case EC_CMD_TYPE_FPWR:
   case EC_CMD_TYPE_FPRW:
   case EC_CMD_TYPE_BRD:
   case EC_CMD_TYPE_BWR:
   case EC_CMD_TYPE_BRW:
   case EC_CMD_TYPE_ARMW:
   case EC_CMD_TYPE_FRMW:
      g_snprintf ( szText, nMax, "EtherCAT datagram: Cmd: '%s' (%d), Len: %d, Adp 0x%x, Ado 0x%x, Cnt %d",
         convertEcCmdToText(ecParser.cmd, EcCmdShort), ecParser.cmd, len, ecParser.anAddrUnion.a.adp, ecParser.anAddrUnion.a.ado, cnt);
      break;
   case EC_CMD_TYPE_LRD:
   case EC_CMD_TYPE_LWR:
   case EC_CMD_TYPE_LRW:
      g_snprintf ( szText, nMax, "EtherCAT datagram: Cmd: '%s' (%d), Len: %d, Addr 0x%x, Cnt %d",
         convertEcCmdToText(ecParser.cmd, EcCmdShort), ecParser.cmd, len, ecParser.anAddrUnion.addr, cnt);
      break;
   case EC_CMD_TYPE_EXT:
      g_snprintf ( szText, nMax, "EtherCAT datagram: Cmd: 'EXT' (%d), Len: %d",  ecParser.cmd, len);
      break;
   default:
      g_snprintf ( szText, nMax, "EtherCAT datagram: Cmd: 'Unknown' (%d), Len: %d",  ecParser.cmd, len);
   }
}

/* Ethercat Datagram */
static void dissect_ecat_datagram(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
   tvbuff_t *next_tvb;
   proto_item *ti, *aitem = NULL;
   proto_tree *ecat_datagrams_tree = NULL;
   guint offset = 0;
   char szText[200];
   int nMax = sizeof(szText)-1;
   guint b;

   guint ecLength=0;
   guint subCount = 0;
   const guint datagram_length = tvb_length_remaining(tvb, offset);
   guint datagram_padding_bytes = 0;
   EcParserHDR ecHdr;

   col_set_str(pinfo->cinfo, COL_PROTOCOL, "ECAT");

   col_clear(pinfo->cinfo, COL_INFO);

   /* If the data portion of an EtherCAT datagram is less than 44 bytes, then
      it must have been padded with an additional n number of bytes to reach a
      total Ethernet frame length of 64 bytes (Ethernet header + Ethernet Data +
      FCS). Hence at least 44 bytes data shall always be available in any
      EtherCAT datagram. */
   /* tvb_ensure_bytes_exist(tvb, offset, 44);
      this is not correct, because the frame might have been captured before the
      os added the padding bytes. E.g. in Windows the frames are captured on the
      protocol layer. When another protocol driver sends a frame this frame does
      not include the padding bytes.
   */

   /* Count the length of the individual EtherCAT datagrams (sub datagrams)
      that are part of this EtherCAT frame. Stop counting when the current
      sub datagram header tells that there are no more sub datagrams or when
      there is no more data available in the PDU. */
   do
   {
      init_EcParserHDR(&ecHdr, tvb, ecLength);
      ecLength += get_cmd_len(&ecHdr);
   } while ((ecLength < datagram_length) &&
            (ecHdr.len & 0x8000));

   /* Calculate the amount of padding data available in the PDU */
   datagram_padding_bytes = datagram_length - ecLength;

   EcSummaryFormater(ecLength, tvb, offset, szText, nMax);
   col_append_str(pinfo->cinfo, COL_INFO, szText);

   if( tree )
   {
      /* Create the EtherCAT datagram(s) subtree */
      ti = proto_tree_add_item(tree, proto_ecat_datagram, tvb, 0, -1, ENC_NA);
      ecat_datagrams_tree = proto_item_add_subtree(ti, ett_ecat);

      proto_item_append_text(ti,": %s", szText);
   }

   /* Dissect all sub frames of this EtherCAT PDU */
   do
   {
      proto_tree *ecat_datagram_tree = NULL, *ecat_header_tree = NULL, *ecat_fmmu_tree = NULL,
                 *ecat_fmmu_active_tree = NULL, *ecat_fmmu_type_tree = NULL, *ecat_syncman_tree = NULL,
                 *ecat_syncflag_tree = NULL, *ecat_dc_tree = NULL;
      proto_item *hidden_item;

      gint bMBox = FALSE;
      guint32 subsize;
      guint32 suboffset;
      guint32 len;
      ETHERCAT_MBOX_HEADER mbox;

      suboffset = offset;
      init_EcParserHDR(&ecHdr, tvb, suboffset);

      subsize = get_cmd_len(&ecHdr);
      len = ecHdr.len & 0x07ff;

      if ( len >= sizeof(ETHERCAT_MBOX_HEADER_LEN) &&
           (ecHdr.cmd==EC_CMD_TYPE_FPWR || ecHdr.cmd==EC_CMD_TYPE_FPRD || ecHdr.cmd==EC_CMD_TYPE_APWR || ecHdr.cmd==EC_CMD_TYPE_APRD) &&
           ecHdr.anAddrUnion.a.ado>=0x1000
         )
      {
         init_mbx_header(&mbox, tvb, suboffset+EcParserHDR_Len);

         switch ( mbox.aControlUnion.v.Type )
         {
         case ETHERCAT_MBOX_TYPE_EOE:
         case ETHERCAT_MBOX_TYPE_ADS:
         case ETHERCAT_MBOX_TYPE_FOE:
         case ETHERCAT_MBOX_TYPE_COE:
         case ETHERCAT_MBOX_TYPE_SOE:
            if ( /*pMBox->Length > 0 &&*/ mbox.Length <= 1500 /*&& pMBox->Length+sizeof(ETHERCAT_MBOX_HEADER_LEN) >= len*/ )
            {
               bMBox = TRUE;
            }
            break;
         }
      }

      if( tree )
      {
         /* Create the sub tree for the current datagram */
         EcSubFormatter(tvb, suboffset, szText, nMax);
         aitem = proto_tree_add_text(ecat_datagrams_tree, tvb, suboffset, subsize, "%s", szText);
         ecat_datagram_tree = proto_item_add_subtree(aitem, ett_ecat_datagram_subtree);

         /* Create a subtree placeholder for the Header */
         aitem = proto_tree_add_text(ecat_datagram_tree, tvb, offset, EcParserHDR_Len, "Header");
         ecat_header_tree = proto_item_add_subtree(aitem, ett_ecat_header);

         EcCmdFormatter(ecHdr.cmd, szText, nMax);
         aitem = proto_tree_add_item(ecat_header_tree, hf_ecat_cmd, tvb, suboffset, sizeof(ecHdr.cmd), ENC_LITTLE_ENDIAN);
         proto_item_set_text(aitem, "%s", szText);
         if( subCount < 10 ){
            aitem = proto_tree_add_item(ecat_header_tree, hf_ecat_sub_cmd[subCount], tvb, suboffset, sizeof(ecHdr.cmd), ENC_LITTLE_ENDIAN);
            PROTO_ITEM_SET_HIDDEN(aitem);
         }

         suboffset+= sizeof(ecHdr.cmd);

         proto_tree_add_item(ecat_header_tree, hf_ecat_idx, tvb, suboffset, sizeof(ecHdr.idx), ENC_LITTLE_ENDIAN);
         if( subCount < 10 ){
            aitem = proto_tree_add_item(ecat_header_tree, hf_ecat_sub_idx[subCount], tvb, suboffset, sizeof(ecHdr.idx), ENC_LITTLE_ENDIAN);
            PROTO_ITEM_SET_HIDDEN(aitem);
         }
         suboffset+= sizeof(ecHdr.idx);

         switch ( ecHdr.cmd )
         {
         case 10:
         case 11:
         case 12:
            proto_tree_add_item(ecat_header_tree, hf_ecat_lad, tvb, suboffset, sizeof(ecHdr.anAddrUnion.a.adp)+sizeof(ecHdr.anAddrUnion.a.ado), ENC_LITTLE_ENDIAN);
            if( subCount < 10 ){
               aitem = proto_tree_add_item(ecat_header_tree, hf_ecat_sub_lad[subCount], tvb, suboffset, sizeof(ecHdr.anAddrUnion.a.adp)+sizeof(ecHdr.anAddrUnion.a.ado), ENC_LITTLE_ENDIAN);
               PROTO_ITEM_SET_HIDDEN(aitem);
            }

            suboffset += (sizeof(ecHdr.anAddrUnion.a.adp)+sizeof(ecHdr.anAddrUnion.a.ado));
            break;
         default:
            proto_tree_add_item(ecat_header_tree, hf_ecat_adp, tvb, suboffset, sizeof(ecHdr.anAddrUnion.a.adp), ENC_LITTLE_ENDIAN);
            if( subCount < 10 ){
               aitem = proto_tree_add_item(ecat_header_tree, hf_ecat_sub_adp[subCount], tvb, suboffset, sizeof(ecHdr.anAddrUnion.a.adp), ENC_LITTLE_ENDIAN);
               PROTO_ITEM_SET_HIDDEN(aitem);
            }

            suboffset+= sizeof(ecHdr.anAddrUnion.a.adp);
            proto_tree_add_item(ecat_header_tree, hf_ecat_ado, tvb, suboffset, sizeof(ecHdr.anAddrUnion.a.ado), ENC_LITTLE_ENDIAN);
            if( subCount < 10 ){
               aitem = proto_tree_add_item(ecat_header_tree, hf_ecat_sub_ado[subCount], tvb, suboffset, sizeof(ecHdr.anAddrUnion.a.ado), ENC_LITTLE_ENDIAN);
               PROTO_ITEM_SET_HIDDEN(aitem);
            }

            suboffset+= sizeof(ecHdr.anAddrUnion.a.ado);
         }

         {
            proto_tree *length_sub_tree;

            /* Add information about the length field (11 bit length, 3 bits
               reserved, 1 bit circulating frame and 1 bit more in a sub tree */
            aitem = proto_tree_add_text(ecat_header_tree, tvb, suboffset, sizeof(ecHdr.len),
                                        "Length     : %d (0x%x) - %s - %s",
                                        len, len, ecHdr.len & 0x4000 ? "Roundtrip" : "No Roundtrip", ecHdr.len & 0x8000 ? "More Follows..." : "Last Sub Command");
            length_sub_tree = proto_item_add_subtree(aitem, ett_ecat_length);

            proto_tree_add_item(length_sub_tree, hf_ecat_length_len, tvb, suboffset, sizeof(ecHdr.len), ENC_LITTLE_ENDIAN);
            proto_tree_add_item(length_sub_tree, hf_ecat_length_r, tvb, suboffset, sizeof(ecHdr.len), ENC_LITTLE_ENDIAN);
            proto_tree_add_item(length_sub_tree, hf_ecat_length_c, tvb, suboffset, sizeof(ecHdr.len), ENC_LITTLE_ENDIAN);
            proto_tree_add_item(length_sub_tree, hf_ecat_length_m, tvb, suboffset, sizeof(ecHdr.len), ENC_LITTLE_ENDIAN);

            suboffset+= sizeof(ecHdr.len);
         }

         proto_tree_add_item(ecat_header_tree, hf_ecat_int, tvb, suboffset, sizeof(ecHdr.intr), ENC_LITTLE_ENDIAN);
         suboffset+= sizeof(ecHdr.intr);
      }
      else
      {
         suboffset+=EcParserHDR_Len;
      }

      if ( ecHdr.cmd>=1 && ecHdr.cmd<=9 && ecHdr.anAddrUnion.a.ado>=0x600 && ecHdr.anAddrUnion.a.ado<0x700 && (ecHdr.anAddrUnion.a.ado%16)==0 && (len%16)==0 )
      {
         if( tree )
         {
            /* Fieldbus Memory Management Units (FMMU) */
            for ( b=0; b < MIN(16, len/16); b++ )
            {
               aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_fmmu, tvb, suboffset, 16, ENC_NA);
               proto_item_set_text(aitem, "Fieldbus Memory Management Units (FMMU)");

               ecat_fmmu_tree = proto_item_add_subtree(aitem, ett_ecat_fmmu);

               proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_lstart, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               suboffset += 4;
               proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_llen, tvb, suboffset, 2, ENC_LITTLE_ENDIAN);
               suboffset += 2;
               proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_lstartbit, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);
               suboffset += 1;
               proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_lendbit, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);
               suboffset += 1;
               proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_pstart, tvb, suboffset, 2, ENC_LITTLE_ENDIAN);
               suboffset += 2;
               proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_pstartbit, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);
               suboffset += 1;
               aitem = proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_type, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);
               ecat_fmmu_type_tree = proto_item_add_subtree(aitem, ett_ecat_fmmu_type);
               proto_tree_add_item(ecat_fmmu_type_tree, hf_ecat_fmmu_typeread, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_fmmu_type_tree, hf_ecat_fmmu_typewrite, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);

               suboffset += 1;
               aitem = proto_tree_add_item(ecat_fmmu_tree, hf_ecat_fmmu_active, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);
               ecat_fmmu_active_tree = proto_item_add_subtree(aitem, ett_ecat_fmmu_active);
               proto_tree_add_item(ecat_fmmu_active_tree, hf_ecat_fmmu_active0, tvb, suboffset, 1, ENC_LITTLE_ENDIAN);

               suboffset += 4;
            }
            if ( len > 0x100 )
            {
               len -= 0x100;
               for (b = 0; b < MIN(32, len / 8); b++)
               {
                  aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_syncman, tvb, suboffset, 8, ENC_NA);
                  proto_item_set_text(aitem, "SyncManager");
                  ecat_syncman_tree = proto_item_add_subtree(aitem, ett_ecat_syncman);

                  proto_tree_add_item(ecat_syncman_tree, hf_ecat_syncman_start, tvb, suboffset, 2, ENC_LITTLE_ENDIAN);
                  suboffset+=2;
                  proto_tree_add_item(ecat_syncman_tree, hf_ecat_syncman_len, tvb, suboffset, 2, ENC_LITTLE_ENDIAN);
                  suboffset+=2;

                  aitem = proto_tree_add_item(ecat_syncman_tree, hf_ecat_syncman_flags, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  ecat_syncflag_tree = proto_item_add_subtree(aitem, ett_ecat_syncflag);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag0, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag1, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag2, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag4, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag5, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag8, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag9, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag10, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag11, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag12, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag13, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag16, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
                  suboffset+=4;
               }
            }
         }
      }
      else if ( ecHdr.cmd>=1 && ecHdr.cmd<=9 && ecHdr.anAddrUnion.a.ado>=0x800 && ecHdr.anAddrUnion.a.ado<0x880 && (ecHdr.anAddrUnion.a.ado%8)==0 && (len%8)==0 )
      {
         if( tree )
         {
            /* SyncManager */
            for (b = 0; b < MIN(32, len / 8); b++)
            {
               aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_syncman, tvb, suboffset, 8, ENC_NA);
               proto_item_set_text(aitem, "SyncManager");
               ecat_syncman_tree = proto_item_add_subtree(aitem, ett_ecat_syncman);

               proto_tree_add_item(ecat_syncman_tree, hf_ecat_syncman_start, tvb, suboffset, 2, ENC_LITTLE_ENDIAN);
               suboffset+=2;
               proto_tree_add_item(ecat_syncman_tree, hf_ecat_syncman_len, tvb, suboffset, 2, ENC_LITTLE_ENDIAN);
               suboffset+=2;

               aitem = proto_tree_add_item(ecat_syncman_tree, hf_ecat_syncman_flags, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               ecat_syncflag_tree = proto_item_add_subtree(aitem, ett_ecat_syncflag);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag0, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag1, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag2, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag4, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag5, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag8, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag9, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag10, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag11, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag12, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag13, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               proto_tree_add_item(ecat_syncflag_tree, hf_ecat_syncman_flag16, tvb, suboffset, 4, ENC_LITTLE_ENDIAN);
               suboffset+=4;
            }
         }
      }
      else if ( (ecHdr.cmd == 1 || ecHdr.cmd == 4) && ecHdr.anAddrUnion.a.ado == 0x900 && ecHdr.len >= 16 )
      {
         if (tree)
         {
            guint32 pDC[4];
            init_dc_measure(pDC, tvb, suboffset);

            /* Allow sub dissectors to have a chance with this data */
            if(!dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, ecat_datagram_tree))
            {
               /* No sub dissector did recognize this data, dissect it as data only */
               aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_data, tvb, suboffset, ecHdr.len & 0x07ff, ENC_NA);
               ecat_dc_tree = proto_item_add_subtree(aitem, ett_ecat_dc);
            }
            else
            {
               /* A sub dissector handled the data, allow the rest of the
                  to add data to the correct place in the tree hierarchy. */
               ecat_dc_tree = ecat_datagram_tree;
            }

            if( subCount < 10 ){
               aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_sub_data[subCount], tvb, offset + EcParserHDR_Len, ecHdr.len & 0x07ff, ENC_NA);
               PROTO_ITEM_SET_HIDDEN(aitem);
            }

            if ( pDC[3] != 0 )
            {
               proto_tree_add_uint(ecat_dc_tree, hf_ecat_dc_diff_da, tvb, suboffset, 4, pDC[3] - pDC[0]);
               if( subCount < 10 ){
                  hidden_item = proto_tree_add_uint(ecat_dc_tree, hf_ecat_sub_dc_diff_da[subCount], tvb, suboffset, 4, pDC[3] - pDC[0]);
                  PROTO_ITEM_SET_HIDDEN(hidden_item);
               }

               if ( pDC[1] != 0 )
               {
                  proto_tree_add_uint(ecat_dc_tree, hf_ecat_dc_diff_bd, tvb, suboffset, 4, pDC[1] - pDC[3]);
                  if( subCount < 10 ){
                     hidden_item = proto_tree_add_uint(ecat_dc_tree, hf_ecat_sub_dc_diff_bd[subCount], tvb, suboffset, 4, pDC[1] - pDC[3]);
                     PROTO_ITEM_SET_HIDDEN(hidden_item);
                  }
               }
               else if ( pDC[2] != 0 )
               {
                  proto_tree_add_uint(ecat_dc_tree, hf_ecat_dc_diff_cd, tvb, suboffset, 4, pDC[2] - pDC[3]);
                  if( subCount < 10 ){
                     hidden_item = proto_tree_add_uint(ecat_dc_tree, hf_ecat_sub_dc_diff_cd[subCount], tvb, suboffset, 4, pDC[2] - pDC[3]);
                     PROTO_ITEM_SET_HIDDEN(hidden_item);
                  }
               }
            }
            if ( pDC[1] != 0 )
            {
               proto_tree_add_uint(ecat_dc_tree, hf_ecat_dc_diff_ba, tvb, suboffset, 4, pDC[1] - pDC[0]);
               if( subCount < 10 ){
                  hidden_item = proto_tree_add_uint(ecat_dc_tree, hf_ecat_sub_dc_diff_ba[subCount], tvb, suboffset, 4, pDC[1] - pDC[0]);
                  PROTO_ITEM_SET_HIDDEN(hidden_item);
               }
               if ( pDC[2] != 0 )
               {
                  proto_tree_add_uint(ecat_dc_tree, hf_ecat_dc_diff_cb, tvb, suboffset, 4, pDC[2] - pDC[1]);
                  if( subCount < 10 ){
                     hidden_item = proto_tree_add_uint(ecat_dc_tree, hf_ecat_sub_dc_diff_cb[subCount], tvb, suboffset, 4, pDC[2] - pDC[1]);
                     PROTO_ITEM_SET_HIDDEN(hidden_item);
                  }
               }
            }
            else if ( pDC[2] != 0 )
            {
               proto_tree_add_uint(ecat_dc_tree, hf_ecat_dc_diff_ca, tvb, suboffset, 4, pDC[2] - pDC[0]);
               if( subCount < 10 ){
                  hidden_item = proto_tree_add_uint(ecat_dc_tree, hf_ecat_sub_dc_diff_ca[subCount], tvb, suboffset, 4, pDC[2] - pDC[0]);
                  PROTO_ITEM_SET_HIDDEN(hidden_item);
               }
            }
         }
      }
      else if ( bMBox )
      {
         const guint MBoxLength = mbox.Length + 6 /* MBOX header length */;

         next_tvb = tvb_new_subset(tvb, suboffset, MBoxLength, MBoxLength);
         call_dissector(ecat_mailbox_handle, next_tvb, pinfo, ecat_datagram_tree);

         if( tree )
         {
            const guint startOfData = offset + EcParserHDR_Len + MBoxLength;
            const guint dataLength = (ecHdr.len & 0x7ff) - MBoxLength;
            if ( dataLength > 0 )
            {
               /* Allow sub dissectors to have a chance with this data */
               if(!dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, ecat_datagram_tree))
               {
                  /* No sub dissector did recognize this data, dissect it as data only */
                  proto_tree_add_item(ecat_datagram_tree, hf_ecat_data, tvb, startOfData, dataLength, ENC_NA);
               }

               if( subCount < 10 ){
                  aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_sub_data[subCount], tvb, startOfData, dataLength, ENC_NA);
                  PROTO_ITEM_SET_HIDDEN(aitem);
               }
            }
         }
      }
      else
      {
         if( tree )
         {
            /* Allow sub dissectors to have a chance with this data */
            if(!dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, ecat_datagram_tree))
            {
               /* No sub dissector did recognize this data, dissect it as data only */
               proto_tree_add_item(ecat_datagram_tree, hf_ecat_data, tvb, suboffset, ecHdr.len & 0x07ff, ENC_NA);
            }

            if( subCount < 10 ){
               aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_sub_data[subCount], tvb, offset + EcParserHDR_Len, ecHdr.len & 0x07ff, ENC_NA);
               PROTO_ITEM_SET_HIDDEN(aitem);
            }
         }
      }

      if( tree )
      {
         proto_tree_add_item(ecat_datagram_tree, hf_ecat_cnt, tvb, offset + EcParserHDR_Len + len , 2, ENC_LITTLE_ENDIAN);
         if( subCount < 10 ){
            aitem = proto_tree_add_item(ecat_datagram_tree, hf_ecat_sub_cnt[subCount], tvb, offset + EcParserHDR_Len + len , 2, ENC_LITTLE_ENDIAN);
            PROTO_ITEM_SET_HIDDEN(aitem);
         }
      }

      offset+=subsize;
      subCount++;
   } while((offset < datagram_length) &&
           (ecHdr.len & 0x8000));

   /* Add information that states which portion of the PDU that is pad bytes.
      These are added just to get an Ethernet frame size of at least 64 bytes,
      which is required by the protocol specification */
   if(datagram_padding_bytes > 0)
   {
      proto_tree_add_item(tree, hf_ecat_padding, tvb, offset, tvb_length_remaining(tvb, offset), ENC_NA);
   }
}

void proto_register_ecat(void)
{
   static hf_register_info hf[] =
   {
      { &hf_ecat_sub,
      { "EtherCAT Frame", "ecat.sub", FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_header,
      { "eader", "ecat.header",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[0],
      {  "Data", "ecat.sub1.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[1],
      {  "Data", "ecat.sub2.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[2],
      {  "Data", "ecat.sub3.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[3],
      {  "Data", "ecat.sub4.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[4],
      {  "Data", "ecat.sub5.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[5],
      {  "Data", "ecat.sub6.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[6],
      {  "Data", "ecat.sub7.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[7],
      {  "Data", "ecat.sub8.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[8],
      {  "Data", "ecat.sub9.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_data[9],
      {  "Data", "ecat.sub10.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_data,
      {  "Data", "ecat.data",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_cnt,
      { "Working Cnt", "ecat.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, "The working counter is increased once for each addressed device if at least one byte/bit of the data was successfully read and/or written by that device, it is increased once for every operation made by that device - read/write/read and write", HFILL }
      },
      { &hf_ecat_sub_cnt[0],
      { "Working Cnt", "ecat.sub1.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[1],
      { "Working Cnt", "ecat.sub2.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[2],
      { "Working Cnt", "ecat.sub3.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[3],
      { "Working Cnt", "ecat.sub4.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[4],
      { "Working Cnt", "ecat.sub5.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[5],
      { "Working Cnt", "ecat.sub6.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[6],
      { "Working Cnt", "ecat.sub7.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[7],
      { "Working Cnt", "ecat.sub8.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[8],
      { "Working Cnt", "ecat.sub9.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cnt[9],
      { "Working Cnt", "ecat.sub10.cnt",
      FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_cmd,
      { "Command", "ecat.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[0],
      { "Command", "ecat.sub1.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[1],
      { "Command", "ecat.sub2.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[2],
      { "Command", "ecat.sub3.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[3],
      { "Command", "ecat.sub4.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[4],
      { "Command", "ecat.sub5.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[5],
      { "Command", "ecat.sub6.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[6],
      { "Command", "ecat.sub7.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[7],
      { "Command", "ecat.sub8.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[8],
      { "Command", "ecat.sub9.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_cmd[9],
      { "Command", "ecat.sub10.cmd",
      FT_UINT8, BASE_HEX, VALS(EcCmdShort), 0x0, NULL, HFILL }
      },
      { &hf_ecat_idx,
      { "Index", "ecat.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[0],
      { "Index", "ecat.sub1.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[1],
      { "Index", "ecat.sub2.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[2],
      { "Index", "ecat.sub3.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[3],
      { "Index", "ecat.sub4.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[4],
      { "Index", "ecat.sub5.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[5],
      { "Index", "ecat.sub6.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[6],
      { "Index", "ecat.sub7.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[7],
      { "Index", "ecat.sub8.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[8],
      { "Index", "ecat.sub9.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_idx[9],
      { "Index", "ecat.sub10.idx",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_adp,
      { "Slave Addr", "ecat.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[0],
      { "Slave Addr", "ecat.sub1.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[1],
      { "Slave Addr", "ecat.sub2.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[2],
      { "Slave Addr", "ecat.sub3.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[3],
      { "Slave Addr", "ecat.sub4.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[4],
      { "Slave Addr", "ecat.sub5.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[5],
      { "Slave Addr", "ecat.sub6.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[6],
      { "Slave Addr", "ecat.sub7.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[7],
      { "Slave Addr", "ecat.sub8.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[8],
      { "Slave Addr", "ecat.sub9.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_adp[9],
      { "Slave Addr", "ecat.sub10.adp",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_ado,
      { "Offset Addr", "ecat.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[0],
      { "Offset Addr", "ecat.sub1.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[1],
      { "Offset Addr", "ecat.sub2.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[2],
      { "Offset Addr", "ecat.sub3.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[3],
      { "Offset Addr", "ecat.sub4.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[4],
      { "Offset Addr", "ecat.sub5.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[5],
      { "Offset Addr", "ecat.sub6.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[6],
      { "Offset Addr", "ecat.sub7.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[7],
      { "Offset Addr", "ecat.sub8.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[8],
      { "Offset Addr", "ecat.sub9.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_ado[9],
      { "Offset Addr", "ecat.sub10.ado",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_lad,
      { "Log Addr", "ecat.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[0],
      { "Log Addr", "ecat.sub1.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[1],
      { "Log Addr", "ecat.sub2.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[2],
      { "Log Addr", "ecat.sub3.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[3],
      { "Log Addr", "ecat.sub4.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[4],
      { "Log Addr", "ecat.sub5.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[5],
      { "Log Addr", "ecat.sub6.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[6],
      { "Log Addr", "ecat.sub7.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[7],
      { "Log Addr", "ecat.sub8.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[8],
      { "Log Addr", "ecat.sub9.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_lad[9],
      { "Log Addr", "ecat.sub10.lad",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_len,
      { "Length", "ecat.len",
      FT_UINT16, BASE_DEC, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_int,
      { "Interrupt", "ecat.int",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_syncman,
      { "SyncManager", "ecat.syncman",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_start,
      { "Start Addr", "ecat.syncman.start",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_len,
      { "SM Length", "ecat.syncman.len",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flags,
      { "SM Flags", "ecat.syncman.flags",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag0,
      { "SM Flag0", "ecat.syncman_flag0",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag0), 0x00000001,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag1,
      { "SM Flag1", "ecat.syncman_flag1",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag1), 0x00000002,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag2,
      { "SM Flag2", "ecat.syncman_flag2",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag2), 0x00000004,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag4,
      { "SM Flag4", "ecat.syncman_flag4",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag4), 0x00000010,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag5,
      { "SM Flag5", "ecat.syncman_flag5",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag5), 0x00000020,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag8,
      { "SM Flag8", "ecat.syncman_flag8",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag8), 0x00000100,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag9,
      { "SM Flag9", "ecat.syncman_flag9",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag9), 0x00000200,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag10,
      { "SM Flag10", "ecat.syncman_flag10",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag10), 0x00000400,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag11,
      { "SM Flag11", "ecat.syncman_flag11",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag11), 0x00000800,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag12,
      { "SM Flag12", "ecat.syncman_flag12",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag12), 0x00001000,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag13,
      { "SM Flag13", "ecat.syncman_flag13",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag13), 0x00002000,
      NULL, HFILL }
      },
      { &hf_ecat_syncman_flag16,
      { "SM Flag16", "ecat.syncman_flag16",
      FT_BOOLEAN, 32, TFS(&tfs_ecat_syncman_flag16), 0x00010000,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu,
      { "FMMU", "ecat.fmmu",
      FT_BYTES, BASE_NONE, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_lstart,
      { "Log Start", "ecat.fmmu.lstart",
      FT_UINT32, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_llen,
      { "Log Length", "ecat.fmmu.llen",
      FT_UINT16, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_lstartbit,
      { "Log StartBit", "ecat.fmmu.lstartbit",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_lendbit,
      { "Log EndBit", "ecat.fmmu.lendbit",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_pstart,
      { "Phys Start", "ecat.fmmu.pstart",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_pstartbit,
      { "Phys StartBit", "ecat.fmmu.pstartbit",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_type,
      { "FMMU Type", "ecat.fmmu.type",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_typeread,
      { "Type", "ecat.fmmu.typeread",
      FT_BOOLEAN, 8, TFS(&tfs_ecat_fmmu_typeread), 0x01,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_typewrite,
      { "Type", "ecat.fmmu.typewrite",
      FT_BOOLEAN, 8, TFS(&tfs_ecat_fmmu_typewrite), 0x02,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_active,
      { "FMMU Active", "ecat.fmmu.active",
      FT_UINT8, BASE_HEX, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_fmmu_active0,
      { "Active", "ecat.fmmu.active0",
      FT_BOOLEAN, 8, TFS(&tfs_ecat_fmmu_active), 0x01,
      NULL, HFILL }
      },
      { &hf_ecat_dc_diff_da,
      { "DC D-A", "ecat.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_dc_diff_bd,
      { "DC B-D", "ecat.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_dc_diff_cb,
      { "DC C-B", "ecat.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_dc_diff_cd,
      { "DC C-D", "ecat.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_dc_diff_ba,
      { "DC B-A", "ecat.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_dc_diff_ca,
      { "DC C-A", "ecat.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0,
      NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[0],
      { "DC D-A", "ecat.sub1.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[1],
      { "DC D-A", "ecat.sub2.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[2],
      { "DC D-A", "ecat.sub3.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[3],
      { "DC D-A", "ecat.sub4.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[4],
      { "DC D-A", "ecat.sub5.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[5],
      { "DC D-A", "ecat.sub6.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[6],
      { "DC D-A", "ecat.sub7.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[7],
      { "DC D-A", "ecat.sub8.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[8],
      { "DC D-A", "ecat.sub9.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_da[9],
      { "DC D-A", "ecat.sub10.dc.dif.da",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },

      { &hf_ecat_sub_dc_diff_bd[0],
      { "DC B-C", "ecat.sub1.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[1],
      { "DC B-C", "ecat.sub2.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[2],
      { "DC B-C", "ecat.sub3.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[3],
      { "DC B-C", "ecat.sub4.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[4],
      { "DC B-C", "ecat.sub5.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[5],
      { "DC B-C", "ecat.sub6.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[6],
      { "DC B-C", "ecat.sub7.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[7],
      { "DC B-C", "ecat.sub8.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[8],
      { "DC B-C", "ecat.sub9.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_bd[9],
      { "DC B-D", "ecat.sub10.dc.dif.bd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },

      { &hf_ecat_sub_dc_diff_cb[0],
      { "DC C-B", "ecat.sub1.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[1],
      { "DC C-B", "ecat.sub2.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[2],
      { "DC C-B", "ecat.sub3.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[3],
      { "DC C-B", "ecat.sub4.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[4],
      { "DC C-B", "ecat.sub5.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[5],
      { "DC C-B", "ecat.sub6.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[6],
      { "DC C-B", "ecat.sub7.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[7],
      { "DC C-B", "ecat.sub8.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[8],
      { "DC C-B", "ecat.sub9.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cb[9],
      { "DC C-B", "ecat.sub10.dc.dif.cb",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },

      { &hf_ecat_sub_dc_diff_cd[0],
      { "DC C-D", "ecat.sub1.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[1],
      { "DC C-D", "ecat.sub2.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[2],
      { "DC C-D", "ecat.sub3.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[3],
      { "DC C-D", "ecat.sub4.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[4],
      { "DC C-D", "ecat.sub5.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[5],
      { "DC C-D", "ecat.sub6.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[6],
      { "DC C-D", "ecat.sub7.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[7],
      { "DC C-D", "ecat.sub8.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[8],
      { "DC C-D", "ecat.sub9.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_cd[9],
      { "DC C-D", "ecat.sub10.dc.dif.cd",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },

      { &hf_ecat_sub_dc_diff_ba[0],
      { "DC B-A", "ecat.sub1.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[1],
      { "DC B-A", "ecat.sub2.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[2],
      { "DC B-A", "ecat.sub3.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[3],
      { "DC B-A", "ecat.sub4.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[4],
      { "DC B-A", "ecat.sub5.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[5],
      { "DC B-A", "ecat.sub6.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[6],
      { "DC B-A", "ecat.sub7.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[7],
      { "DC B-A", "ecat.sub8.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[8],
      { "DC B-A", "ecat.sub9.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ba[9],
      { "DC B-A", "ecat.sub10.dc.dif.ba",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },

      { &hf_ecat_sub_dc_diff_ca[0],
      { "DC C-A", "ecat.sub1.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[1],
      { "DC C-A", "ecat.sub2.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[2],
      { "DC C-A", "ecat.sub3.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[3],
      { "DC C-A", "ecat.sub4.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[4],
      { "DC C-A", "ecat.sub5.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[5],
      { "DC C-A", "ecat.sub6.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[6],
      { "DC C-A", "ecat.sub7.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[7],
      { "DC C-A", "ecat.sub8.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[8],
      { "DC C-A", "ecat.sub9.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_sub_dc_diff_ca[9],
      { "DC C-A", "ecat.sub10.dc.dif.ca",
      FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
      },
      { &hf_ecat_length_len,
      { "Length", "ecat.subframe.length",
      FT_UINT16, BASE_DEC, NULL, 0x07ff, NULL, HFILL}
      },
      { &hf_ecat_length_r,
      { "Reserved", "ecat.subframe.reserved",
      FT_UINT16, BASE_DEC, VALS(ecat_subframe_reserved_vals), 0x3800, NULL, HFILL}
      },
      { &hf_ecat_length_c,
      { "Round trip", "ecat.subframe.circulating",
      FT_UINT16, BASE_DEC, VALS(ecat_subframe_circulating_vals), 0x4000, NULL, HFILL}
      },
      { &hf_ecat_length_m,
      { "Last indicator", "ecat.subframe.more",
      FT_UINT16, BASE_DEC, VALS(ecat_subframe_more_vals), 0x8000, NULL, HFILL}
      },
      { &hf_ecat_padding,
      { "Pad bytes", "ecat.subframe.pad_bytes",
      FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL}
      }
   };

   static gint *ett[] =
   {
      &ett_ecat,
      &ett_ecat_header,
      &ett_ecat_syncman,
      &ett_ecat_syncflag,
      &ett_ecat_fmmu,
      &ett_ecat_fmmu_type,
      &ett_ecat_fmmu_active,
      &ett_ecat_dc,
      &ett_ecat_length,
      &ett_ecat_padding,
      &ett_ecat_datagram_subtree
   };

   proto_ecat_datagram = proto_register_protocol("EtherCAT datagram(s)",
      "ECAT", "ecat");
   proto_register_field_array(proto_ecat_datagram, hf, array_length(hf));
   proto_register_subtree_array(ett, array_length(ett));

   /* Sub dissector code */
   register_heur_dissector_list("ecat.data", &heur_subdissector_list);
}

/* The registration hand-off routing */
void proto_reg_handoff_ecat(void)
{
   dissector_handle_t ecat_handle;

   /* Register this dissector as a sub dissector to EtherCAT frame based on
      ether type. */
   ecat_handle = create_dissector_handle(dissect_ecat_datagram, proto_ecat_datagram);
   dissector_add_uint("ecatf.type", 1 /* EtherCAT type */, ecat_handle);

   ecat_mailbox_handle = find_dissector("ecat_mailbox");
}