modbus-rtu-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_RTU_PRIVATE_H_
#define _MODBUS_RTU_PRIVATE_H_
#ifndef _MSC_VER
#include <stdint.h>
#else
#include "stdint.h"
#endif
#if defined(_WIN32)
#include <windows.h>
#else
#include <termios.h>
#endif
#define _MODBUS_RTU_HEADER_LENGTH 1
#define _MODBUS_RTU_PRESET_REQ_LENGTH 6
#define _MODBUS_RTU_PRESET_RSP_LENGTH 2
#define _MODBUS_RTU_CHECKSUM_LENGTH 2
/* Time waited beetween the RTS switch before transmit data or after transmit
data before to read */
#define _MODBUS_RTU_TIME_BETWEEN_RTS_SWITCH 10000
#if defined(_WIN32)
#if !defined(ENOTSUP)
#define ENOTSUP WSAEOPNOTSUPP
#endif
/* WIN32: struct containing serial handle and a receive buffer */
#define PY_BUF_SIZE 512
struct win32_ser {
/* File handle */
HANDLE fd;
/* Receive buffer */
uint8_t buf[PY_BUF_SIZE];
/* Received chars */
DWORD n_bytes;
};
#endif /* _WIN32 */
typedef struct _modbus_rtu {
/* Device: "/dev/ttyS0", "/dev/ttyUSB0" or "/dev/tty.USA19*" on Mac OS X for
KeySpan USB<->Serial adapters this string had to be made bigger on OS X
as the directory+file name was bigger than 19 bytes. Making it 67 bytes
for now, but OS X does support 256 byte file names. May become a problem
in the future. */
#if defined(__APPLE_CC__)
char device[64];
#else
char device[16];
#endif
/* Bauds: 9600, 19200, 57600, 115200, etc */
int baud;
/* Data bit */
uint8_t data_bit;
/* Stop bit */
uint8_t stop_bit;
/* Parity: 'N', 'O', 'E' */
char parity;
#if defined(_WIN32)
struct win32_ser w_ser;
DCB old_dcb;
#else
/* Save old termios settings */
struct termios old_tios;
#endif
#if HAVE_DECL_TIOCSRS485
int serial_mode;
#endif
#if HAVE_DECL_TIOCM_RTS
int rts;
#endif
/* To handle many slaves on the same link */
int confirmation_to_ignore;
} modbus_rtu_t;
#endif /* _MODBUS_RTU_PRIVATE_H_ */