–

–

–

–

20

21

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 20 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.

Figure 19: Message ID Values

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

StopBits

1

Parity

0

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 20: SetSerialPort Example

Query

214

Get configuration and last state of all GPIOs

Query

215

Get configuration and current state of all

GPIOs

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 21 contains the values for the following example:

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

Figure 21: 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

TimeOfWeek

497260

seconds

GPS Time Of Week

WeekNo

921

GPS Week Number

ChannelCount

12

Range 1 to 12

ResetCfg

3

See Figure 22

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 22: ResetCfg Values