4 pin Garmin round special connector at the GPS unit.
This connector is available on: Garmin GPS 12 XL, GPS II, III, V, 72, 76, 92, 176, 176c, 196, 295, StreetPilot III.
The 4-pin round connector is the proprietary data and power interface fitted to a wide range of Garmin GPS receivers, including the GPS 12 XL, II, III, V, 72, 76, 92, 176, 176c, 196, 295, and StreetPilot III. It carries serial data in and out, ground, and power input, and may be connected to a PC serial port using a straight-through cable. Only the four pins listed below are defined for this connector.
| Pin | Name | Description | cable color |
|---|---|---|---|
| 1 | RXD | data in | white |
| 2 | TXD | data out | brown |
| 3 | GND | ground | black |
| 4 | VCC | power input | red |
Notes
- This GPS unit may be connected to PC serial port with simple straight through cable.
References
- Garmin GPS to PC Wiring Instructions (P/N 190-00222-00) — Garmin Corporation; “units with 4 pin round plug”.