I can receive data from LS20031 but i can't send data??

GPS/GNSS Development Boards
1

Hi all

I already bought LS20031 , and it great module for GPS application …

by default it use 57600 baud rate

now I phase one problem on it >>>> which is I can’t send command to it , when I send it does not repose. but when I use mini GPS application , I can easily control the module such as frequency rate and enable WAAS …

where is my problem … what I miss ?

I try this command in putty or in miKroc UART but still same problem …

$PMTK320,0*26
``` with <CR><LF>

$PMTK102*31

$PMTK103*30


please advice .. 

regards
2

According to [this page, the checksum character should be 2F.

HTH,

gm](NMEA MTK checksum calculator)

3

still the same problem ,

please advice …

4

If it works with the vendor software and not yours then I would suggest you are not sending the right data to the device. I would recommend using a protocol analyzer (if you have access to one) or using an RS-232 sniffer program to record the bytes the vendor software is sending. Compare that to what you are sending to find your error.

5

Ok , I will test this ,

regards

6

your are the great , I use rs232 monitor and yes , the wrong is in chicksum , but i see other manual for this GPS

http://www.adafruit.com/datasheets/PMTK_A08.pdf

please update the one in buy page

regards