GSM Module does not respond

I removed PIN from SIM card, selected IDC mode 2, connected to 24V source and when I run TinyGSM example AT_Debug it says:

"Module does not respond!

Check your Serial wiring

Check the module is correctly powered and turned on"

I tried all the other examples but non of them works. Blue LED on GSM module starts blinking after 1 second push on power button

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Asked on 5/17/18, 3:09 PM

Hi, can you try with an example modified for Industruino, at

If you use the 'Serial' port for GSM/GPRS in combination with the INDIO, you have to disconnect 'Serial' from the RS485 port. There is a hardware switch on the baseboard, put it in the upper position to disconnect from the RS485 (away from the RS485 pins).

Please note that the Industruino GSM/GPRS module uses D6 as power on/off pin (it needs 1s HIGH); the relevant lines in the setup() switch the module ON in case it was OFF (or OFF in case it was ON, which can cause some confusion)


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Answered on 5/23/18, 12:52 AM

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Asked: 5/17/18, 3:09 PM
Seen: 1779 times
Last updated: 5/23/18, 12:52 AM