I need to connect a 2711 k6c9 panelview to a ML1200 PLC. I do have a spare 1761 cbl pm02 cable. What do i need to do to this cable to get the comms working between the two. Looks like i have to cross pins 2 and 3 on DB9. If anyone have experience with this pl help. Rockwell states that i need a null modem adapter. Is it some thing that you buy from a raido shop?