–

–

–

–

24

25

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 25 contains the values for the following example:

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

Figure 25: 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 26

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.

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

Figure 26: ResetCfg Values

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 27 below 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 28 below contains the values for the following example:

$PSRF117,16*0B

Figure 27: 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 28: System Turn Off Example