Cayman Systems 2E-H-W Manual de usuario descargar pdf (Pagina 20)

NMEA Manual based on MediaTek chipset - Manual

38400

57600

115200

Example:

$PMTK251,38400*27<CR><LF>

2.21.1 Setting 5 Hz navigation

For 5 Hz you need to change the baud rate to 38400 in order to handle the increased message load in serial

port.

Command for changing the baud rate to 38400:

$PMTK251,38400*27

The output in the terminal should show obscured data.

Then you need to change the baud rate from the terminal program to 38400.

After you can see NMEA sentences again, you are ready to give next command.

Command for setting the Fix Rate to 5 Hz:

$PMTK300,200,0,0,0,0*2F

2.21.2 Setting 10 Hz navigation

10 Hz setting works only with IT500 receiver

You can do it with first giving command PMTK251(baud rate) followed by command PMTK300(fixrate).

Command for changing the baud rate to 115200:

$PMTK251,115200*1F

The output in the terminal should show obscured data.

Then you need to change the baud rate from the terminal program to 115200.

After you can see NMEA sentences again, you are ready to give next command.

Command for setting the Fix Rate to 10 Hz:

$PMTK300,100,0,0,0,0*2C

You can reset the settings by powering off the module and removing the backup battery jumper from

application board.

Remember to set the CR+LF for sending the command from the terminal program.

E.g. in the Tera Term program, see Figure 1 for the settings.

2.22 PMTK286 ENABLE AIC

Command purpose:

Enable Active Interference Cancellation (AIC).

The Active Interference cancellation feature provides effective narrow-band interference and jamming

elimination. The GPS signal could be recovered from the jammed signal and let the user get better navigation

quality.

By default this feature is disabled.

Command number: 286

DataField:

Enabled: Enable or disable

‘0’ = Disable

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Cayman Systems 2E-H-W Manual de usuario Pagina 20