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2.GQ Geiger Muller Counter

Led control

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morettigiorgio

Italy
2 Posts

Posted - 01/29/2026 : 13:52:02

Good morning,
I own a GMC-500+ (GMC-500+Re 2.53" version) and I'm trying to write a repository to display Geiger counter data in Home Assistant via MQTT (if you're curious: https://github.com/morettigiorgio/geiger-mqtt-ha).
I noticed that register 60 of GETCFG should contain the front LED status.
Is it possible to manage it somehow, like with the speaker?
Thanks

Reply #1

EmfDev

2391 Posts

Posted - 01/29/2026 : 15:36:39

yes you can find it here:
https://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=10927&SearchTerms=.h

Reply #2

morettigiorgio

Italy
2 Posts

Posted - 01/30/2026 : 01:17:27

Thank you very much for your prompt response.
I'd actually already noticed this forum page, but I haven't implemented the use of <WCFG[A1][A0][D0]>> yet to avoid writing incorrect configurations.
I'm basing this on GQ-RFC1801, which I found at this link:
https://www.gqelectronicsllc.com/download/GQ-RFC1801.txt
Based on this documentation, I currently use commands like SPEAKER0 and SPEAKER1... I was wondering if there were similar commands for the LED as well, or if I have to read all 512 bytes and then rewrite them with the modification, or if other commands have simply been added to GQ-RFC1801 that I'm unaware of.
Thank you very much for your reply.

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