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- 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>
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