I'm using the DigiXtend 900 modems instead of the Xbee pros. Since they are soooo expensive, I do not want to but a third. So I'm looking into hijacking the MAVLink in order to use the telemetry for both ArduStation and the GCS software. Is this the same setup that I will need for the Xtends, use the Xtend on my COM1 port--->ArduStation in COM2 port with FTDI to USB? And when you mean invert TX and RX, what exactly are you referring to?
You need to connect your ardustation to the PC via FTDI cable, inverting TX with RX between the FTDI and ardustation. That's all. Just one COM Port. Your modem stays only in Ardustation.