Software Commands - Globalsat ER-332 User Manual

* PBRES (Push button reset): This pin provides an active-low reset input to the engine board. It causes
the engine board to reset and start searching for satellites.
* SELECT: Do not connect (do not use)
* TXA: This is the main transmits channel for outputting navigation and measurement data to user's
navigation software or user written software.
* RXA: This is the main receive channel for receiving software commands to the engine board from
SiRFdemo software or from user written software. Normally this pin must be kept in high, and if you don't
use this pin please connect a resistor to pull high. (NOTE: When not in use this pin must be kept "HIGH" for
operation. From Vcc connect a 470 Ohm resistor in series with a 3.2v Zener diode to Ground. Then,
connect the Rx input to Zener's cathode to pull the input "HIGH".)
* Time mark: This pin provides one pulse-per-second output from the engine board that is synchronized
to GPS time.
* GND: GND provides the ground for the engine board. Connect all grounds.

3. Software Commands

NMEA Output Command
GGA-Global Positioning System Fixed Data
Table B-2 contains the values for the following example:
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,,,,0000*18
Table B-2 GGA Data Format
Name
Message ID
UTC Time
Latitude
N/S Indicator
Longitude
E/W Indicator
Position Fix Indicator
Satellites Used
HDOP
1
MSL Altitude
Units
Geoid Separation
Units
Example
$GPGGA
161229.487
3723.2475
N
12158.3416
W
1
07
1.0
9.0
M
1
M
ER-332
Units Description
GGA protocol header
hhmmss.sss
ddmm.mmmm
N=north or S=south
dddmm.mmmm
E=east or W=west
See Table B-3
Range 0 to 12
Horizontal Dilution of Precision
meters
meters
meters
meters
Specifications are subject to be changed without notice.
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