Altina GPS GBT 709 - Manual (Page 10)

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【Table 1】: Pin Definition
4.6. External Active Antenna connector
Ø Connector type: MMCX, 180˚
Ø Active power voltage: 3.0V
Ø Length: 5 meter
4.7. Power Jack & Data Port
Ø
Jack type: Mating face of 5 pin Mini USB Type B female
Ø
Pin definition please see 【Table 1】
Pin Pin Name Signal and description
1 GND Signal ground, Battery charging ground.
2 VOUT Unregulated voltage out: 3.6 V max 100mA.
3 TXD
Transmit Data.
From organizer to peripheral.(Voltage Level is 3.3V ~ 5.0V).
4 RXD
Receive Data.
Form peripheral to organizer.(Voltage level is 3.3V ~ 5.0V).
5 VCHARG
Positive terminal of DC adaptor that powers the internal charging circuit
of Li-Ion battery. The approved power supply is 5.0V +/- 5%@1A.
1 5