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Pin Name cable color
1 power input red
2 ground black
3 com 1 tx (out) blue
4 com 1 rx (in) brown
5 com 2 rx (in) white
6 com 2 tx (out) green
7 alarm (low) yellow


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7 pin Garmin proprietary of Garmin GPS 7 pin connector layout
7 pin Garmin proprietary connector
at the back of unit
Source(s) of this and additional information: www.garmingps.com, http://static.garmincdn.com/pumac/GPSMAP192C_OwnersManual.pdf
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