I have the above in a GSM alarm system. It stopped working so i pressed reset. It now works, however, i have no idea how to set it up as i have lost the instructions. Think it started each SMS with “TN”? Is there a standard code that this chip would use?

Thanks for your help.


No - it is entirely down to the application, I’m afraid.

Thanks for your advice. looks like i will have to buy a new one. Lesson learned; file instructions away!

You should contact the manufacturer of the alarm system.They should know.