Linx-technologies RXM-GPS-SR Manual de usuario descargar pdf (Pagina 9)

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103 – Query/Rate Control

This command is used to control the output of standard NMEA messages GGA,

GLL, GSA, GSV, RMC, and VTG. Using this command message, standard

NMEA messages may be polled once, or setup for periodic output. Checksums

may also be enabled or disabled depending on the needs of the receiving

program. NMEA message settings are saved in battery-backed memory for each

entry when the message is accepted.

The table below contains the values for the following example:

1. Query the GGA message with checksum enabled

$PSRF103,00,01,00,01*25

2. Enable VTG message for a 1 Hz constant output with checksum enabled

$PSRF103,05,00,01,01*20

3. Disable VTG message

$PSRF103,05,00,00,01*21

Name Example Units Description

Message ID $PSRF103 PSRF103 protocol header

Msg 0 See Table 17

Mode 1 0=SetRate, 1=Query

Rate 0 seconds Output – off=0, max=255

CksumEnable 1 0=Disable, 1=Enable Checksum

Checksum *25

<CR><LF> End of message termination

Value Description

0 GGA

1 GLL

2 GSA

3 GSV

4 RMC

5 VTG

6 MSS (Not Supported)

7 Not defined

8 ZDA

9 Not defined

Table 15: Query/Rate Control Example

Table 16: MSG Values

104 – LLANavigationInitialization

This command was used to initialize the receiver with the current position (in

lattitude, longitude and altitude coordinates), clock offset, and time, enabling a

faster fix. Increased receiver sensitivity and the removal of Selective Availability

(SA) have made this unneccessary. The command is retained for its ability to

reset the module, but the initialization fields are no longer supported.

The table below contains the values for the following example:

$PSRF104,0,0,0,96000,0,0,12,4*1A

Name Example Units Description

Message ID $PSRF104 PSRF104 protocol header

Latitude 0

Longitude 0

Altitude 0

ClkOffset 96000

TimeOfWeek 0

WeekNo 0

ChannelCount 12

ResetCfg 4 See Table 19

Checksum *1A

<CR><LF> End of message termination

Hex Description

0x01 Hot Start – All data valid

0x02 Warm Start – Ephemeris cleared

0x04 Cold Start – Clears all data in memory

0x08

Clear Memory – Clears all data in memory and resets receiver back to

factory defaults

Table 17: LLANavigationInitialization Example

Table 18: ResetCfg Values

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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