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GPS
Product series
3.3.1 VCC_5V
This is the main DC power supply for a +3.3~ 5.5 V engine board.
3.3.2 TXA
This is the main transmitting channel and is used to output navigation and
measurement data for user written software.
3.3.3 RXA
This is the main receiving channel and is used to receive software
commands to the board from user written software.
3.3.4 RXB
This is the auxiliary receiving channel and is used to input differential
corrections to the board to enable DGPS navigation.
3.3.5 GND
GND provides the ground for the board. Connect all grounds.
3.3.6 TIMEMARK (default)/ RESET (option)
This pin default is provides 1 pulse per second output from the GR-87
engine board, which is synchronized to within 1 microsecond of GPS time. The
output is a CMOS 3V positive level signal. Only upon a situation of tracking or
navigating will output once per second. This is not available in Trickle-Power
mode.
The secondary option function is provides an active-low reset input to the
engine board. It causes the engine board to reset and start searching for
satellites. (This second function setting need contact factory).
4. Ordering Information
Output Level
Model No.
(CMOS 3V or
RS-232)
GR-87-T0A
CMOS 3V
GR-87-T0B
CMOS 3V
GR-87-T0C
CMOS 3V
GR-87-T0D
CMOS 3V
HOLUX Technology, Inc.
1F, No.30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park)
TEL: 886-3-6687000 FAX:886-3-6687111 E-mail:info@holux.com.tw Website:www.holux.com.tw
RF interface
Back-up battery
output voltage (V)
2.8
2.8
VCC_IN
VCC_IN
With HOLUX, You never lose the way!
Power
(Rechargeable
Saving
Lithium)
Y
Y
Y
Y
Y
Y
Y
Y
RF
Connector
Type
MMCX(180∘)
MMCX(90∘)
MMCX(180∘)
MMCX(90∘)
6
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