L80 Baurate change - not durable?

Technical Subjects Software General Function
1

Hello,
I have a Quectel L80 Module earlier set to 4800 Bd. It have worked stable with this baudrate over years. Now I want to change it back to 9600 Bd. I use the command “$PMTK251,9600*17” with CR-LF on end. To send it I use the terminal program Hterm. The command make the L80 working with 9600 Bd - all seems o.k. But if I switch the power off the L80 and switch on the baudrate is 4800 Bd again. The L80 seems to guess the 9600 Bd change if power off. What I have to do to get the 9600 Bd stable after switch off and on the power.
Thank you very mutch for help.
Best Regards from Germany

Now I have found the solution - this (new) command set the Baudrate durable:
$PQBAUD,W,384007B
$PQBAUD,W,96004B

But the command $PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29
is not durable too. Is there a similar command which durable saves the output only for RMC?

2

Hallo gzielos,

  1. Yes, changes made by PQ commands can be saved after a power outage. (Changes via PMTK commands will not be saved.)
  2. So far we don’t have PQ command for NMEA output configuration, it has to be reset after a complete power outage. However, it’s recommended to keep V_BCKP powered (e.g. with a battery), thus the configuration will not be changed by a restart or switch off.

Liebe Grüße aus China,
Meiji

1 Like
3

Hallo Meiji,
thank you for the hints - thank you for the greetings in German too. It is a pitty that we have not PQ commands for some funktions. Is there a hope to get a PQ command for NMEA output configuration? I will realize a minimal GPS long time tracker with L80 and OpenLog from sparkfun. This OpenLog uses the serial communication to save the serial data from L80 on a µSD card. For this is the GRMC sentence sufficient.
Liebe Grüße aus Deutschland
Gunther

4

Hallo Gunther,

We will internally evaluate if we can add PQ commands for NMEA output configuration. We will update you as soon as we get the feedback.

Liebe Grüße
Meiji

5

Hi @gzielos ,

We will add a PQ command for NMEA configuration. It’s in progress.

Best regards

6

Hi @gzielos ,

We’ve developed the PQ command for NMEA configuration, it’s currently the beta-version. Please find the corresponding documentation and firmware via your private message.

Best regards

7

Hello Meiji,
there are some problems to use the $PQNMEARATE command. I try to change the NMEA sets to $PQNMEARATE,W,0,1,0,0,0,0*7E
(only the RMC sentence).
But the result is:

$GPGLL,000410.800,V,N77
$GPRMC,000411.800,V,0.00,0.00,060180,N4E
$GPVTG,0.00,T,M,0.00,N,0.00,K,N32
$GPGGA,000411.800,0,0,M,M,44
$GPGSA,A,1,1E
$GPGSV,1,1,01,16,147A
$GPGLL,000411.800,V,N76
$PQNMEARATE,W,0,1,0,0,0,07E
$GPRMC,000412.800,V,0.00,0.00,060180,N4D
$GPVTG,0.00,T,M,0.00,N,0.00,K,N32
$GPGGA,000412.800,0,0,M,M,47
$GPGSA,A,1,1E
$GPGSV,1,1,01,16,147A
$GPGLL,000412.800,V,N75
$GPRMC,000413.800,V,0.00,0.00,060180,N4C
$GPVTG,0.00,T,M,0.00,N,0.00,K,N32
$GPGGA,000413.800,0,0,M,M,46
$GPGSA,A,1,1E
$GPGSV,1,1,01,16,147A
$GPGLL,000413.800,V,N74

There is no answer to $PQNMEARATE,W,0,1,0,0,0,0*7E and no reaction,
there is nothing! What shell I do??? Please help me
Best Regards
Gunther

8

Dear Sir,
Please make sure you have successfully updated L80GR01A11S_BETA0401.
My set-up after upgrading that BETA0401 version:
$PQVERNO,R3F // query version if upgrade success.
$PQNMEARATE,R7A //query current para…
$PQNMEARATE,W,0,1,0,0,0,07E //disable other messages (in list) except RMC.
$PQTXT,W,0,123 //disable $GPTXT message.
Please refer to my log(please change its extension from .zip to .txt):
Log-L80GR01A11S_BETA0401.zip (48.5 KB)

Also attached the latest protocol doc:
Quectel_Lx0&Lx6&LC86L&LG77L_GNSS_Protocol_Specification_V2.1 (1).pdf (525.1 KB)

Regards

9

Hello Berton Peng,
thank you for the hints. I have questions:
All my problems are with L80 - is the upgrating really for L80?
How can I realize the upgrade, what tools I need?
thank you again and greetings from Germany
Gunther Zielosko

10

Dear Sir,
Please ensure that you module is L80 instead of L80-R which is a ROM version and doesn’t support PQ commands.
Regarding to upgrade for L80:
1, you could use PC tool FlashTool_exe_v4.1.0.rar to upgrade and refer to EVB User guide.
Quectel_L80&L80-R&L86&LC86L_EVB_User_Guide_V2.0.pdf (2.7 MB)
Flashtoolv4.0.zip (547.4 KB)
Regards