Enable HDT Sentence on LG580P

IoT Modules GNSS Module
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I am trying to enable the HDT sentence on my LG580P. I need it to output heading to a device, ideally over USB. What is the exact command to send to change the setting in QGNSS v2?

I know I need to set the baseline with this: PQMT Commands - SparkFun LG580P GNSS Breakout Hookup Guide

Then I need to enable the (NMEA) HDT message with another command, this one I am not sure on. Ideally at the highest output frequency available, 10Hz or 20Hz if possible.

Then save the configuration with this: (same linke above) /#pqtmsavepar

PS: I don’t understand how to get the QGNSS software to auto create the correct checksum for the commands.

2

Hi @ian5142

Q：I am trying to enable the HDT sentence on my LG580P. I need it to output heading to a device, ideally over USB. What is the exact command to send to change the setting in QGNSS v2?
A:Please LG290P&LGx80P Series GNSS Protocol Specification. I have sent Relative technology document to you through email, please check it.
step1：$PQTMCFGMSGRATE,W,HDT,113
step2：$PQTMSAVEPAR5A
step3：reset module

Q:Then I need to enable the (NMEA) HDT message with another command, this one I am not sure on. Ideally at the highest output frequency available, 10Hz or 20Hz if possible.
A:The module is set to default output at 10Hz, with a maximum of 20Hz. This command configures HDT to output once for each positioning, so after the setting, it will output at 10Hz.

Q: I don’t understand how to get the QGNSS software to auto create the correct checksum for the commands.
A: If you use QGNSS V2.2, command will be checksum automatically.(QGNSS_V2.2_EN | Quectel)
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If you use QGNSS V1.10 (https://market.quectel.com/docsdownload/QGNSS_V1.10_EN.zip )

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image1214×545 23.5 KB

Best regards

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I input those commands and restarted the device. It still does not output any HDT sentences.

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I missed the “*” before the 13 in the checksum. I still don’t know how to get the QGNSS 2.2 software to automatically create the checksum.

OK, it is outputting HDT sentences but they are all empty, no heading. Can I get it to output them with just a 3D fix, I can’t easily receive RTCM3 messages from a fixed base because this will be installed on a boat.

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$PQTMCFGMSGRATE,W,PQTMTAR,1,1*09
$PQTMCFGMSGRATE,W,HDT,1*13
$PQTMCFGMSGRATE,W,THS,1*04

$PQTMSAVEPAR*5A
$PQTMSRR*4B

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On Sparkfun forum…for better help.
Regards