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WARNING:
Do not place the GR-239 under strong sunlight for a
long time. Do not place it in a high temperature
environment, or near heat radiating devices such as
a stove or radiator. Doing so will cause the device to
malfunction.
4.3. Data Port
Below listed the description of the GR-239 USB data port.
PIN Function Signal and description
1 GND Power and system ground.
2 NC N/A
3 TXD
Data output pin. Transfers data to
external device. (Output voltage
range: CMOS 3.0V Level)
4 RXD
Data input pin. Transfers data from
external device to GPS. (Input
voltage range: CMOS 3.0V Level)
5 NC N/A
PIN 5 PIN 1