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3.5. Power Supply
Ø External Voltage: 5VDC +/- 10%
Ø Batteries：
n Main Power: Built-in rechargeable Lithium-ion for system power
Ø Backup Power: Rechargeable Lithium-ion battery for memory & RTC backup
Ø Working voltage:
n Normal Mode: 75-85mA
n Power Saving Mode: 30mA
Ø Working period (In Battery full power status):
n Continued Mode: 12 hours
n Power Saving Mode: 16 hours
【NOTE 1】GBT-709 has built Li-battery inside, please avoid closing high temperature
environment or sun shine directly for a long time.
3.6. Output and Interface
Ø Output
I. Output protocol
u Baud Rate：38400 bps
u Data bit：8
u Parity：No
u Stop bit：1
II. Format -NMEA0183 V2.2：
GPGGA (1time/1 sec), GPGSA (1 time/5 sec.), GPGSV (1time /5 sec.), GPRMC
(1time /1 sec.), GPVTG(1 time/I sec), (GLL, or SiRF binary format for optional).
III. Datum：WGS84
Ø Input/ Output Interface
I. Compatible Bluetooth Serial Port Profile (SPP), Version1.1 and class 2(up
to 10 meter range).
II. In/Out Port. GPS signal (Out)/Command(In) with CMOS/TTL Level。
n Mini USB Type B Connector and Cable option：
u GAC60R2 (RS232 data cable)
u GAC60U2 (USB data cable)
u GAC60UP2 (Mini USB port to PS2 port ).