SKU: AT-UHD-EX-70C-KIT, AT-UHD-EX-100CE-KIT
Subject: RS232 Pass-through connection (do you need to cross the TX and RX pins?)
The RS232 ports on the AT-UHD-EX-70C-KIT and AT-UHD-EX-100CE-KIT are straight-through RS232 ports. This means you do not have to cross the TX pin off your controller to the RX pin on the Atlona and vice versa.
You simply connect the TX pin of your controller to the TX pin on the extender and RX from your controller to RX on the Atlona extender. Ground goes to ground. This will then pass through RS232 from one end of the extenders to the other. You do not have to cross the pins or install any null modem adapters.
However, if you find that you are unable to get control over a device through the extenders, please try swapping the TX and RX pins on the receiver (i.e. AT-UHD-EX-70C-RX) and see if you are able to get control after doing so.
Article ID: KB01208