This standard null modem cable is used to connect your GPS receiver to a field computer or real-time source. It is compatible with the GPS Pathfinder ProXH and ProXT receivers, GeoExplorer series handhelds (with the optional serial clip), GeoBeacon receiver, BoB receiver, Trimble Recon handheld, and the GPS Pathfinder Pro XRS receiver. For field use, the Curly Null Modem Cable (P/N 43377) is recommended as an alternative.