L89 not responding to any command

Hi All,

Thnak you for this great Forum, it is very useful.

I have a problem with the L89, I have bought the L89 installed on Click board from Mikroelectronika.
I connected it to my MCU and also terminal program

I’m receiving data from it but when i send any command without checksum it never respond, when i add the check sum and send any command with checksum it only reply with one respond $PAIR001,000,4*3F
I can not upgrade the firmware by booting or normal upgrade.
below is the data send from the module when I power up:


Dear Sir

Please check the firmware version through the following command: $PQTMVERNO*58

The version will be returned normally, as shown in the figure below:

Best Regards

Dear Stone,

thank you for you reply.

the module returned the following message:


looking forward for your support.

Dear Sir

  1. The returned “$PAIR001,000,4*3F” is a parameter error, please provide the commands you sent.
  2. The flash tool for upgrade have been sent to your Email, please check.

Best Regards

Hi Stone,

I’m sending the following:

$PSTMGETPAR,1101*22 ( to get the UART port address)

I sent also $PSTMCFGPORT,0,0,1,115200*77 to change baud rate to 115200 and both commands returning the same error message.

Dear Sir

Please refer to the attached protocol document, the module you are using is L89 R2.0.

Best Regards
Quectel_L89 R2.0_GNSS_Protocol_Specification_V1.0_Preliminary_20200429.pdf (367.5 KB)