It depends on what SLC 500 processor you purchased.
The communication options are as follows.
SLC 5/01 and 5/02 - DH485 comms only, which requires an expensive PIC module or PCMK card and cable.
SLC 5/03 - DH485 and RS232 comms. With RS232 you can use a null-modem serial cable and the serial...
