Linx-technologies RXM-GPS-R4 Manuel d'utilisateur télécharger pdf (Page 12)

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100 – SetSerialPort

This command message is used to set the protocol (SiRF binary or NMEA)

and/or the communication parameters (baud rate). Generally, this

command is used to switch the module back to SiRF binary protocol mode

where a more extensive command message set is available. When a valid

message is received, the parameters are stored in battery-backed SRAM

and the receiver restarts using the saved parameters.

Figure 18 contains the values for the following example:

Switch to SiRF binary protocol at 9600,8,N,1

$PSRF100,0,9600,8,1,0*0C

For details on the SiRF binary protocol, please refer to SiRF’s Binary

Protocol Reference Manual.

SetSerialPort Example

Name Example Description

Message ID $PSRF100 PSRF100 protocol header

Protocol 0 0=SiRF binary, 1=NMEA

Baud 9600 4800, 9600, 19200, 38400, 57600, 115200

DataBits 8 8

StopBits 1 0, 1

Parity 0 0=None, 1=Odd, 2=Even

Checksum *0C

<CR> <LF> End of message termination

1. SiRF protocol is only valid for 8 data bits, 1 stop bit and no parity.

2. Default settings are NMEA protocol using 9,600 baud, 8 data bits, 2 stop bits and no

parity.

Figure 18: SetSerialPort Example

101 – NavigationInitialization

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

X, Y, Z 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 19 contains the values for the following example:

$PSRF101,-2686700,-4304200,3851624,96000,497260,921,12,3*1C

Figure 19: NavigationInitialization Example

NavigationInitialization Example

Name Example Units Description

Message ID $PSRF101 PSRF101 protocol header

ECEF X -2686700 meters X coordinate position

ECEF Y -4304200 meters Y coordinate position

ECEF Z 3851624 meters Z coordinate position

ClkOffset 96000 Hz Clock Offset

TimeOfWeek 497260 seconds GPS Time Of Week

WeekNo 921 GPS Week Number

ChannelCount 12 Range 1 to 12

ResetCfg 3 See Figure 20

Checksum *1F

<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 20: ResetCfg Values

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19

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