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4 pin Garmin proprietary connector layout
4 pin Garmin proprietary connector
at the back of unit
4 pin connector, found on the back cover.
Pin Name cable color
1V+ (power in)maximum of 3.15V, recommended 3V
2data in (RS232 Rx)green
3data out (RS232 Tx)white
4groundblack
May be connected directly to PC serial port
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