Quote Originally Posted by joecar View Post
Looks like it will do serial comms, page 2 shows a diagram showing Rx/Tx...

I can't tell from here...

if you can connect the PLX to a PC via serial comms and talk to it from the PC, then you need the null modem functionality (i.e. swapping Rx and Tx).
It does. But they are using a USB to connect to a PC.