Have you looked at a Prodigy? Serial ports are 3 wire and Pheonix connectors only. You screw the wire on to the connector. Therefore, you could use premade connectors, cut them in half and only connect the TX$, RX$ and ground with no issues. Prodigy and Adagio com ports ONLY support RS-232. Therefore pins 4 and 6 which are used in RS-422 on 2Series processors will not give any issues on Adagio and don't exist on Prodigy; nor do Prodigy or Adagio com ports support RS-485.
Alan
"This is a Christian Country,Charlie,founded on Christian values...when you can't put a nativiy scene in front fire house at Christmas time in Nacogdoches Township, something's gone terribly wrong"