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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <modbus.h>
#define SLAVE_ID 1
#define START_ADDRESS 0
#define NUMBER_REGISTERS 14
#define DEBUG_MODE 0
int main(int argc, char *argv[])
{
if ( argc != 2 ){
return -1;
}
modbus_t *ctx;
uint16_t tab_reg[64];
int rc;
int i;
ctx = modbus_new_rtu(argv[1], 19200, 'E', 8, 1);
modbus_set_slave(ctx, SLAVE_ID);
modbus_set_debug(ctx, DEBUG_MODE);
if (ctx == NULL) {
fprintf(stderr, "Unable to create the libmodbus context\n");
return -1;
}
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
rc = modbus_read_input_registers(ctx, START_ADDRESS, NUMBER_REGISTERS, tab_reg);
if (rc == -1) {
fprintf(stderr, "ERROR: %s\n", modbus_strerror(errno));
return -1;
}
for (i=0; i < rc; i=i+2) {
printf("reg[%d]=%d\n", i, tab_reg[i]+tab_reg[i+1]);
}
modbus_close(ctx);
modbus_free(ctx);
return 0;
}
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