Permalink
Fetching contributors…
Cannot retrieve contributors at this time
57 lines (39 sloc) 1.58 KB
modbus_rtu_set_serial_mode(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 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 Stéphane Raimbault
<stephane.raimbault@gmail.com>