RS-485 and RS-422 COM_C and COM_D can support RS-232 or RS-485 or RS-422 protocols. Jumpers are used to select which mode is to be used for each port. There are also jumpers to add 120 ohm termination resistors for the TX and RX pairs. Termination resistors may be required when...
The RTU part implies the use of an RS232 or RS485 physical communication link. Alternatively, you can simply crosslink the UART Rx and Tx lines, if the Modbus client and server form one system, e.g. they reside on the same PCB. What do you need In this tutorial our PC acts as the...