RGPSD212 Semtech, RGPSD212 Datasheet - Page 15

• Manufacturer Part Number: RGPSD212
• Description: KIT EVAL FOR RGPSM202
• Manufacturer: Semtech
• Type: GPSr

Specifications of RGPSD212

• Contents: Interface Board, Module, Antenna, USB Cable, Software and Documentation CD
• For Use With/related Products: RGPSM202
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.4
The NMEA 0183 Standard 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:
$PXEMmaa,x1,x2,x3,x4,….,xN*hh
where m – sentence type: ‘Q’ for ‘query’, ‘S’ for ‘set’, ‘R’ for ‘response’; aa – proprietary sentence identifier (see below);
x1…xN – data parameters (only for set and query response sentences); hh – sentence checksum
NOTE: Each of the data parameters must be preceded with a comma, except for the aa sentence identifier, and the
checksum which is preceded with a checksum delimiter character ‘*’.
• QUERY sentence: to send a query sentence, no data fields are transmitted. The following format is used:
• RESPONSE sentence to QUERY: for a query sentence, a response sentence with all fields is transmitted. The
• SET sentence: to send a set sentence, x1…xN must contain valid values. The following format is used:
• RESPONSE sentence to SET: for a set sentence, a status response sentence is transmitted. The following format is
The following proprietary NMEA sentence identifiers are implemented:
5.4.1
This sentence outputs a diagnostic string. It is used to report various error conditions. This is a response-only sentence.
$PXEMRDI,ccccccc*hh
5.4.2
Description: This sentence contains information which helps a monitoring station figure out the status of the receiver.
This sentence can be automatically output at a given rate by setting Bit #9 of the NMEA sentence mask (see NM-
Sentence Mask and Automatic Output Rate section below). This is a query-only sentence.
$PXEMaTF,a,a,xxxxxx,xx,x,llll.lllll,a,yyyyy.yyyyy,a,xxxxx*hh
© Semtech 2005
$PXEMQaa*hh
following format is used:
$PXEMRaa,x1,x2,x3,x4,….,xN*hh
$PXEMSaa,x1,x2,x3,x4,….,xN*hh
used:
$PXEMRaa,s*hh
where s is the status of the requested action: ‘A’ if the action was successful; ‘V’ otherwise.
NMEA SPECIFIC SENTENCES
DI – Diagnostic Message
TF—Quick Test
where ccccccc is a diagnostic string up to 50 characters
15
SlimGPS™ Receiver
RGPSM202
www.semtech.com