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Checksum
<CR> <LF>
(1) All "course over ground" data are geodetic WGS84 directions.
4.1.7 Time & Date (ZDA)
Table 4-11 contains the values for the following example:
$GPVTG,114523.62,12,04,2001,10,34*6E
Table 4-11 ZDA Data Format
Name
Message ID
Hour, Min, Sec, Sub
Sec
Day
Month
Year
Local Zone Hours
Local Zone Minutes
Checksum
<CR> <LF>
4.2 RTCM Received Data
The default communication parameters for DGPS Input are 9600 baud, 8 data bits, stop bit, and no
parity. Position accuracy of less than 5 meters can be achieved with the GPS-22 by using Differential GPS
(DGPS) real-time pseudo-range correction data in RTCM SC-104 format, with message types 1, 5, or 9. As
using DGPS receiver with different communication parameters, GPS-22 may decode the data correctly to
generate accurate messages and save them in battery-back SRAM for later computing.
4.3 Syntax Setting
4.3.1 Basic Manufacturing Default:
Datum: WGS84.
Baud Rate: 9600/4800.
Output: GGA, GSA, GSV, RMC or by demand.
* Details please see paragraph 4.4
4.3.2 Output Setting
4.3.2.1 General Description
The NMEA Standard v2.1 dictates that proprietary NMEA sentences have the following structure:
$Paaaxxxxxxxxxxxxx*hh
where aaa – mnemonic code, XEM in our case; xxxxxxxxx...– data; hh – sentence checksum
Two types of input sentences are defined: query and set. Query sentences request certain information from
the receiver. Set sentences allow configuring the receiver with certain configuration parameters or forcing
the receiver to perform a specific action. For each type of input sentences, a corresponding output response
sentence is defined.
For a query sentence, the response sentence contains requested data. For a set sentence, the response
sentence contains the status of the action requested in the set sentence. Taking these aspects into account,
the following is the general structure of the specific NMEA sentence:
Rikaline
International Corp.
Tel: ++886 2 8973-1899 Fax: ++886 2 8973-1896 E-Mail: info@rikaline.com.tw web: www.rikaline.com.tw
GPS-22 Operating Manual
*6E
End of message termination
Example
Units
$GPZDA
ZDA protocol header
114523.62
Hhmmss.ss
12
Day in UTC, 01to 12
04
Month in UTC, 01 to 12
2001
Year in UTC
10
Local zone hours, +/- 13 hours
L
34
*6E
End of message termination
Specifications subject to change without prior notice
14F
, 171, ChengGong Rd., Sanchong City, Taipei 241, Taiwan, R. O.C
Description
ocal zone minutes, 0 to +59
Rikaline
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