test-modbus-slave.c
3.44 KB
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/*
Copyright (C) 2001-2007 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
These library of functions are designed to enable a program send and
receive data from a device that communicates using the Modbus protocol.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <modbus.h>
int main(void)
{
const int nb_coil_status = 500;
const int nb_input_status = 500;
const int nb_input_registers = 500;
const int nb_holding_registers = 500;
int socket;
modbus_param_t mb_param;
modbus_mapping_t mb_mapping;
int ret;
int i;
modbus_init_tcp(&mb_param, "127.0.0.1");
modbus_set_debug(&mb_param, TRUE);
modbus_mapping_new(&mb_mapping,
nb_coil_status, nb_input_status, nb_input_registers, nb_holding_registers);
/* Examples from PI_MODBUS_300.pdf */
/* Coil status */
mb_mapping.tab_coil_status[26] = ON;
mb_mapping.tab_coil_status[25] = ON;
mb_mapping.tab_coil_status[24] = OFF;
mb_mapping.tab_coil_status[23] = OFF;
mb_mapping.tab_coil_status[22] = ON;
mb_mapping.tab_coil_status[21] = ON;
mb_mapping.tab_coil_status[20] = OFF;
mb_mapping.tab_coil_status[19] = ON;
/* Input status */
mb_mapping.tab_input_status[203] = ON;
mb_mapping.tab_input_status[202] = OFF;
mb_mapping.tab_input_status[201] = ON;
mb_mapping.tab_input_status[200] = OFF;
mb_mapping.tab_input_status[199] = ON;
mb_mapping.tab_input_status[198] = ON;
mb_mapping.tab_input_status[197] = OFF;
mb_mapping.tab_input_status[196] = OFF;
mb_mapping.tab_input_status[211] = ON;
mb_mapping.tab_input_status[210] = ON;
mb_mapping.tab_input_status[209] = OFF;
mb_mapping.tab_input_status[208] = ON;
mb_mapping.tab_input_status[207] = ON;
mb_mapping.tab_input_status[206] = OFF;
mb_mapping.tab_input_status[205] = ON;
mb_mapping.tab_input_status[204] = ON;
/* Incomplete byte */
mb_mapping.tab_input_status[217] = ON;
mb_mapping.tab_input_status[216] = ON;
mb_mapping.tab_input_status[215] = OFF;
mb_mapping.tab_input_status[214] = ON;
mb_mapping.tab_input_status[213] = OFF;
mb_mapping.tab_input_status[212] = ON;
/* Holding registers */
mb_mapping.tab_holding_registers[107] = 0x022B;
mb_mapping.tab_holding_registers[108] = 0x0000;
mb_mapping.tab_holding_registers[109] = 0x0064;
/* Input registers */
mb_mapping.tab_input_registers[8] = 0x000A;
socket = modbus_init_listen_tcp(&mb_param);
i =0;
while (i++ < 5) {
unsigned char query[MAX_PACKET_SIZE];
int query_size;
int i;
ret = modbus_listen(&mb_param, query, &query_size);
if (ret == 0)
manage_query(&mb_param, query, query_size, &mb_mapping);
else
printf("Error in modbus_listen (%d)\n", ret);
}
close(socket);
modbus_mapping_free(&mb_mapping);
modbus_close(&mb_param);
return 0;
}