Hi Cloudhound,
Once you configure the relevant USB Port (to which you intend to connect the USB/RS232 Serial Converter) to the ‘Transponder Trig’ setting (selectable from a drop-down menu), PilotAware automatically sends NMEA-0183 protocol GPS messages to this USB port. These are then converted to RS232 format by the USB to RS232 converter lead and can be fed to the relevant pins of the transponder.
Provided you have obtained the recommended FTDI USB-RS232-WE-1800-BT-0.0 cable, you only need to connect the Orange wire to the wire from Pin 3 (RS232 In 2) on the Trig Secondary Connector and the Black Ground wire to the wire from Ground Pin A on the Trig Secondary Connector.
You also need to make the relevant settings in the Trig to accept NMEA messages, set the correct Baud Rate (in BOTH devices) - normally 4800 or 9600 Baud, and the appropriate setting for an uncertified GPS source (normally Level ‘D’ - Uncertified). Trig are generally happy (not to mention quick) to provide a free firmware update if necessary. If there is any doubt as to the version in your unit, or the settings to be made, give them a call. Their support technicians are aware of the PilotAware principles.
Hope this helps.
Best Regards
Peter
