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4 pin Garmin round proprietary connector layout
4 pin Garmin round proprietary connector
at the GPS unit
Pin Name
1 DATA RX into the unit (RS232 Rx)
2 DATA TX from the unit (RS232 Tx)
3 GROUND
4 Vcc (8 to 40 V) read manual before for the maximum allowed. Most of GPS units may be charged with +12V power supply (for example from car cigarette lighter connector)
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Pinouts.ru > GPS receivers connectors pinouts listing > Pinout of Garmin GPS 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III (round connector) and layout of 4 pin Garmin round special connector
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