GPS 19x HVS bidirectional data

[barrymac]

I have recently got myself a new GPS receiver and I'm surprised at the number of data connections is has, being merely a receiver.

I would like to know what is the purpose of all the data cables. I am intending to connect it to a nmea multiplexer and for this I would only need a single TX out from the reciever.

Why does it have a second TX out and two RX connections? What information would a chart plotter give to the GPS receiever and why would it need two connections?

I could imagine one being used for firmware upgrades.

[smac999]

it has one Tx and one rx (pos and neg wires for each)


not sure what the rx is for. probably updates like you said. or to restart / reboot gps (normally an option in the gps screen)

[barrymac]

Information I got by enquiring with Garmin was that it can be used to update the devices firmware only, when plugged into a Garmin chartplotter.