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Gns601 Configuration; Checksum Calculation - GNS 601 Manual

Starter kit

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GNS 601 StarterKit

5 GNS601 configuration

In all cases, where a UART or USB connection to a PC is available, the GNS601 offers a comfortable

way to reprogram the firmware options or settings using the bidirectional NMEA command interface.

Note:

Removing the power of the GPS device will effect that any modified setting will be lost

and reset to factory default settings. If the module has backup power supply through

VBACKUP or coin battery, it will be able to keep the modified setting until the backup

power is exhausted.

After selecting the preferred settings or features at the GPS GLONASS NMEAcommandInferface

manual document, first the checksum has to be calculated for this command, refer to chapter 5.1

Checksum Calculation. To execute the $PMTK command, the embedded communication software of

your PC operating system can be used. Chapter 5.2 shows an example to execute an NMEA command

using the RS232 communication software "HyperTerminal" of the Windows© operating system.

5.1

To execute the a $PMTK command it is required to terminate the command by *<chksum>and a

<CR><LF>. The checksum calculation is simple, just XOR all the bytes between the $ and the * (not

including the delimiters themselves). Then use the hexadecimal ASCII format.

Or use the checksum tool at the \Software\Checksum tool folder, which is available on Starter Kit CD or

at the GNS forum: www.forum.gns-gmbh.com.

Example: $PMTK226,3,30*4<CR><LF>

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