<![CDATA[Unit CatM]]>There is no serial response from this unit. No answer to AT @ 115200. Any idea?

]]>https://community.m5stack.com/topic/3987/unit-catmRSS for NodeWed, 29 Apr 2026 14:08:50 GMTTue, 01 Feb 2022 22:37:54 GMT60<![CDATA[Reply to Unit CatM on Wed, 02 Feb 2022 08:20:54 GMT]]>Hello @ckuehnel

could you share some additional information? E.g.

  • which M5Stack core is it connected to?
  • which Groove port are you using?
  • how do you initialize the serial connection?
  • which GPIOs are you using for TX and RX?
  • could you share your UiFlow or Arduino code?

Also these SIM7xxx modems take some time to initialize before they react to AT commands. Try sending the AT command a couple of times.

Thanks
Felix

]]>https://community.m5stack.com/post/16473https://community.m5stack.com/post/16473Wed, 02 Feb 2022 08:20:54 GMT