modbus-tcp-private.h
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/*
* Copyright © 2001-2011 Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _MODBUS_TCP_PRIVATE_H_
#define _MODBUS_TCP_PRIVATE_H_
#define _MODBUS_TCP_HEADER_LENGTH 7
#define _MODBUS_TCP_PRESET_REQ_LENGTH 12
#define _MODBUS_TCP_PRESET_RSP_LENGTH 8
#define _MODBUS_TCP_CHECKSUM_LENGTH 0
/* In both structures, the transaction ID must be placed on first position
to have a quick access not dependant of the TCP backend */
typedef struct _modbus_tcp {
/* Extract from MODBUS Messaging on TCP/IP Implementation Guide V1.0b
(page 23/46):
The transaction identifier is used to associate the future response
with the request. This identifier is unique on each TCP connection. */
uint16_t t_id;
/* TCP port */
int port;
/* IP address */
char ip[16];
} modbus_tcp_t;
#define _MODBUS_TCP_PI_NODE_LENGTH 1025
#define _MODBUS_TCP_PI_SERVICE_LENGTH 32
typedef struct _modbus_tcp_pi {
/* Transaction ID */
uint16_t t_id;
/* TCP port */
int port;
/* Node */
char node[_MODBUS_TCP_PI_NODE_LENGTH];
/* Service */
char service[_MODBUS_TCP_PI_SERVICE_LENGTH];
} modbus_tcp_pi_t;
#endif /* _MODBUS_TCP_PRIVATE_H_ */