44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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/*
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* Copyright © Stéphane Raimbault <stephane.raimbault@gmail.com>
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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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_API modbus_t *
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modbus_new_rtu(const char *device, int baud, char parity, 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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MODBUS_API int modbus_rtu_set_serial_mode(modbus_t *ctx, int mode);
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MODBUS_API int modbus_rtu_get_serial_mode(modbus_t *ctx);
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#define MODBUS_RTU_RTS_NONE 0
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#define MODBUS_RTU_RTS_UP 1
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#define MODBUS_RTU_RTS_DOWN 2
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MODBUS_API int modbus_rtu_set_rts(modbus_t *ctx, int mode);
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MODBUS_API int modbus_rtu_get_rts(modbus_t *ctx);
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MODBUS_API int modbus_rtu_set_custom_rts(modbus_t *ctx,
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void (*set_rts)(modbus_t *ctx, int on));
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MODBUS_API int modbus_rtu_set_rts_delay(modbus_t *ctx, int us);
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MODBUS_API int modbus_rtu_get_rts_delay(modbus_t *ctx);
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MODBUS_END_DECLS
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#endif /* MODBUS_RTU_H */
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