title: libmodbus : Unable to Poll modbus energy meter having stop bit as 2
body: <p>I am trying to poll n schneider Energymeter in having parity as none and stop bit as 2 using a RS485 to USB converter. I am getting connection timed out error. But when I try to poll the same meter with parity as none and stopbit as 1, I am able to receive the data.</p>
  
  <p>The code snippet I am using to poll the meter is as follows</p>
  
  <pre><code>     ctx = modbus_new_rtu("/dev/ttyUSB0",9600, 'N', 8, 2);
       modbus_set_debug(ctx, TRUE);
        if (modbus_connect(ctx) == -1) {
             printf("Modbus Connection failed: %s", modbus_strerror(errno));
             modbus_free(ctx);
             return -1;
        }
        modbus_set_slave(ctx,2);
        memset(tab_rp_registers, 0, 2 * sizeof(uint16_t));
        rc = modbus_read_registers(ctx,3109,2,tab_rp_registers);
        modbus_close(ctx);
        modbus_free(ctx);
        if (rc != -1) {
        // actions performed
  
        }
        else {
        free(tab_rp_registers);
        printf("Error str is %s\n",modbus_strerror(errno));
         }
  </code></pre>
  
  <p>Always I am getting the rc as -1 and the Connection timed out error when converting the errno.</p>
  
  <p>Am I missing anything ? </p>