GPS-22 Operating Manual
Rikaline
Specifications subject to change without prior notice
Rikaline
International Corp.
14F
, 171, ChengGong Rd., Sanchong City, Taipei 241, Taiwan, R. O.C
Tel: ++886 2 8973-1899 Fax: ++886 2 8973-1896 E-Mail: [email protected] web: www.rikaline.com.tw
Checksum *6E
<CR> <LF>
End of message termination
(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 Example
Units
Description
Message ID
$GPZDA
ZDA protocol header
Hour, Min, Sec, Sub
Sec
114523.62
Hhmmss.ss
Day
12
Day in UTC, 01to 12
Month
04
Month in UTC, 01 to 12
Year
2001
Year in UTC
Local Zone Hours
10
Local zone hours, +/- 13 hours
Local Zone Minutes
34
L
ocal zone minutes, 0 to +59
Checksum *6E
<CR> <LF>
End of message termination
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
se
t.
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:
