/*

* 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_H

#define MODBUS_RTU_H

#include "modbus.h"

MODBUS_BEGIN_DECLS

/* Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5

* RS232 / RS485 ADU = 253 bytes + slave (1 byte) + CRC (2 bytes) = 256 bytes

*/

#define MODBUS_RTU_MAX_ADU_LENGTH 256

MODBUS_API modbus_t* modbus_new_rtu(const char *device, int baud, char parity,

int data_bit, int stop_bit);

#define MODBUS_RTU_RS232 0

#define MODBUS_RTU_RS485 1

MODBUS_API int modbus_rtu_set_serial_mode(modbus_t *ctx, int mode);

MODBUS_API int modbus_rtu_get_serial_mode(modbus_t *ctx);

#define MODBUS_RTU_RTS_NONE 0

#define MODBUS_RTU_RTS_UP 1

#define MODBUS_RTU_RTS_DOWN 2

MODBUS_API int modbus_rtu_set_rts(modbus_t *ctx, int mode);

MODBUS_API int modbus_rtu_get_rts(modbus_t *ctx);

MODBUS_END_DECLS

#endif /* MODBUS_RTU_H */