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MODBUS_RTU_SET_SERIA(3)        Libmodbus Manual        MODBUS_RTU_SET_SERIA(3)

NAME
       modbus_rtu_set_serial_mode - set the serial mode

SYNOPSIS
       int modbus_rtu_set_serial_mode(modbus_t *ctx, int mode);

DESCRIPTION
       The modbus_rtu_set_serial_mode() function shall set the selected serial
       mode:

       MODBUS_RTU_RS232
           the serial line is set for RS232 communication. RS-232 (Recommended
           Standard 232) is the traditional name for a series of standards for
           serial binary single-ended data and control signals connecting
           between a DTE (Data Terminal Equipment) and a DCE (Data
           Circuit-terminating Equipment). It is commonly used in computer
           serial ports

       MODBUS_RTU_RS485
           the serial line is set for RS485 communication. EIA-485, also known
           as TIA/EIA-485 or RS-485, is a standard defining the electrical
           characteristics of drivers and receivers for use in balanced
           digital multipoint systems. This standard is widely used for
           communications in industrial automation because it can be used
           effectively over long distances and in electrically noisy
           environments.

       This function is only supported on Linux kernels 2.6.28 onwards.

RETURN VALUE
       The modbus_set_serial_mode() function shall return 0 if successful.
       Otherwise it shall return -1 and set errno to one of the values defined
       below.

ERRORS
       EINVAL
           The current libmodbus backend is not RTU.

       ENOTSUP
           The function is not supported on your platform.

       If the call to ioctl() fails, the error code of ioctl will be returned.

AUTHORS
       The libmodbus documentation was written by Stephane Raimbault
       <stephane.raimbault@gmail.com[1]>

NOTES
        1. stephane.raimbault@gmail.com
           mailto:stephane.raimbault@gmail.com

libmodbus 3.1.0                   10/06/2013           MODBUS_RTU_SET_SERIA(3)