Linx-technologies RXM-GPS-R4 Uživatelský manuál stáhnout pdf (Strana 14)

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104 – LLANavigationInitialization

This command is 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.

Figure 23 contains the values for the following example:

$PSRF104,37.3875111,-121.97232,0,96000,237759,1946,12,1*07

Figure 23: NavigationInitialization Example

LLANavigationInitialization Example

Name Example Units Description

Message ID $PSRF104 PSRF104 protocol header

Latitude 37.3875111 degrees Latitude position (Range 90 to –90)

Longitude

–121.97232 degrees

Longitude position (Range 180 to

–180)

Altitude 0 meters Altitude position

ClkOffset 96000 Hz

Clock Offset of the Evaluation

Receiver1

TimeOfWeek 237759 seconds GPS Time Of Week

WeekNo 1946

Extended GPS Week Number (1024

added)

ChannelCount 12 Range 1 to 12

ResetCfg 1 See Figure 24

Checksum *07

<CR> <LF> End of message termination

1. Use 0 for the last saved value if available. If this is unavailable, a default value of

96000 is used.

Figure 24: ResetCfg Values

ResetCfg Values

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 the receiver

back to factory defaults

105 – Development Data On / Off

Use this command to enable development data information if you are

having trouble getting commands accepted. Invalid commands generate

debug information that helps to determine the source of the command

rejection. Common reasons for input command rejection are invalid

checksum or parameter out of speciﬁed range.

Figure 25 contains the values for the following example:

1. Debug On

$PSRF105,1*3E

2. Debug Off

$PSRF105,0*3F

117 – System Turn Off

This message requests that the GPS receiver perform an orderly shutdown

and switch to hibernate mode.

Figure 26 contains the values for the following example:

$PSRF117,16*0B

Figure 25: Development Data On / Off Example

Development Data On / Off Example

Name Example Units Description

Message ID $PSRF105 PSRF105 protocol header

Debug 1 0=Off, 1=On

Checksum *3E

<CR> <LF> End of message termination

1. Default setting is debug mode off.

System Turn Off Example

Name Example Units Description

Message ID $PSRF117 PSRF117 protocol header

Sub ID 16 16: System turn off

Checksum *0B

<CR> <LF> End of message termination

Figure 26: System Turn Off Example

1 2 ... 9 10 11 12 13 14 15 16 17 18 19

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