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client_tcp_remote.c
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client_tcp_remote.c
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#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include "modbus.h"
#define MODBUS_CLIENT_IP "140.127.196.105"
#define MODBUS_CLIENT_PORT 5502
#define MODBUS_DEVICE_ID 10
#define MODBUS_TIMEOUT_SEC 3
#define MODBUS_TIMEOUT_USEC 0
#define MODBUS_DEBUG ON
#define MODUBS_HOLDING_ADDR 0
#define MODUBS_HOLDING_LEN 64
int main(int argc, char *argv[])
{
modbus_t *ctx;
struct timeval timeout;
int ret, ii;
/*uint8_t bits[MODBUS_MAX_READ_BITS] = {0};*/
uint16_t regs[MODBUS_MAX_READ_REGISTERS] = {0};
char regs2[MODBUS_MAX_READ_REGISTERS]={0};
FILE *fp = NULL;
if(argc != 3){
printf("INsufficient argument");
return 1;
}
ctx = modbus_new_tcp(MODBUS_CLIENT_IP, MODBUS_CLIENT_PORT);
/* set device ID */
modbus_set_slave(ctx, MODBUS_DEVICE_ID);
/* Debug mode */
modbus_set_debug(ctx, MODBUS_DEBUG);
/* set timeout */
timeout.tv_sec = MODBUS_TIMEOUT_SEC;
timeout.tv_usec = MODBUS_TIMEOUT_USEC;
modbus_get_byte_timeout(ctx, &timeout);
timeout.tv_sec = MODBUS_TIMEOUT_SEC;
timeout.tv_usec = MODBUS_TIMEOUT_USEC;
modbus_set_response_timeout(ctx, &timeout);
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connexion failed: %s\n",
modbus_strerror(errno));
modbus_free(ctx);
exit(-1);
}
/* write data in test.txt */
fp = fopen("test.txt", "w");
if(fp == NULL)
{
printf("fail to open file!\n");
return -1;
}
/* read holding registers (0x03 function code) */
ret = modbus_read_registers(ctx, strtol(argv[1], NULL, 16), strtol(argv[2], NULL, 10), regs);
if (ret < 0) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
}
else {
printf("HOLDING REGISTERS:\n");
for (ii=0; ii < ret; ii++) {
sprintf(regs2, "%d", regs[ii]);
fputs(regs2, fp);
fputs("\n", fp);
printf("[%d]=%d\n", ii, regs[ii]);
}
}
fclose(fp);
/* Close the connection */
modbus_close(ctx);
modbus_free(ctx);
exit(0);
}