GPSM001 Datasheet, PDF (11/20 Pages) rfsolutions.ltd – OEM GPS Receiver Module

OEM GPS Receiver Module
GPSM001
$PXEMmaa,x1,x2,x3,x4,….,xN*hh
where m – command type: ‘Q’ for ‘query’, ‘S’ for ‘set’, ‘R’ for ‘response’; aa – proprietary command identifier (see
below); x1…xN – data parameters (only for set and query response commands); hh – command checksum
NOTE: Each of the data parameters must be preceded with a comma, except for the aa command identifier, and the
checksum which is preceded with a checksum delimiter character ‘*’.
• QUERY command: to send a query command, no data fields are transmitted. The following format is used:
$PXEMQaa*hh
• RESPONSE command to QUERY: for a query command, a response command with all fields is transmitted. The
following format is used:
$PXEMRaa,x1,x2,x3,x4,….,xN*hh
• SET command: to send a set command, x1…xN must contain valid values. The following format is used:
$PXEMSaa,x1,x2,x3,x4,….,xN*hh
• RESPONSE command to SET: for a set command, a status response command is transmitted. The following format is
used:
$PXEMRaa,s*hh
where s is the status of the requested action: ‘A’ if the action was successful; ‘V’ otherwise.
The following proprietary NMEA command identifiers are implemented:
DI – Diagnostic Message
This command outputs a diagnostic string. It is used to report various error conditions. This is a response-only
command.
$PXEMRDI,ccccccc*hh
where ccccccc is a diagnostic string up to 50 characters
NM – Command Mask and Automatic Output Rate
This command configures the application to automatically output standard NMEA commands at a specified time
interval.
$PXEMaNM,xxxx,xx*hh
Name
Message ID
Mask
Rate
<CR><LF>
Example
Units
$PXEMaNM
0008
01
sec
Description
Proprietary NM protocol header, a-mode (S = set;
R = response)
xxxx Output command mask, hex value (see
Notes below)
xx Automatic output command rate (00 to 99)
End of message termination
Table 12 NM Data Format
Notes: xxxx is a hexadecimal value representing a 2-byte bit-mask where a specific bit sets or clears automatic output
of a particular NMEA command according to the table below. The mask is derived by combining all bits which represent
the NMEA commands which will be automatically output. For example, to automatically output GGA, GSA, ZDA, and
RMC, the bits 0, 4, 5, and 8 are set to 1 in a 2-byte mask, resulting in a hex value 0x131 (0x1+0x10+0x20+0x100). This
value is sent as an ASCII string ‘0131’ in the xxxx field of the NM command.
NMEA
xxxx
Command
GGA
GLL
VTG
Bit#
0
1
2
Field value
0001
0002
0004
DS031-2 Jan ‘04
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