43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/*
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* Copyright © 2001-2011 Stéphane Raimbault <stephane.raimbault@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _MODBUS_RTU_H_
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#define _MODBUS_RTU_H_
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#include "modbus.h"
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MODBUS_BEGIN_DECLS
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/* Modbus_Application_Protocol_V1_1b.pdf Chapter 4 Section 1 Page 5
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* RS232 / RS485 ADU = 253 bytes + slave (1 byte) + CRC (2 bytes) = 256 bytes
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*/
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#define MODBUS_RTU_MAX_ADU_LENGTH 256
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modbus_t* modbus_new_rtu(const char *device, int baud, char parity,
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int data_bit, int stop_bit);
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#define MODBUS_RTU_RS232 0
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#define MODBUS_RTU_RS485 1
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int modbus_rtu_set_serial_mode(modbus_t *ctx, int mode);
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int modbus_rtu_get_serial_mode(modbus_t *ctx);
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MODBUS_END_DECLS
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#endif /* _MODBUS_RTU_H_ */
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