Setting Up the Protocol of a Serial Interface

AC500 CPUs PM57x, PM58x and PM59x are equipped with the two interfaces COM1 and COM2 which can be operated as RS-232 and RS-485.

Note

RS-485 operation of an interface is only possible if the parameter RTS control is set to Telegram. The cabling of RS-232 or RS-485 is detected automatically by the hardware.

AC500 PM55x and PM56x CPUs are equipped with two interfaces COM1 and COM2 (optional) which can be operated as RS-485 only. The parameter RTS control is set by default to Telegram and can not be changed.