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May 14, 2012
about 4 years ago
Hi all, I am working on a project to send SMS.
I am connecting my Cellular shield to a PC and using Hyperterminal.
Cellular powered and Start the Communication…
The last +SIND should be +SIND: 4 but it isn’t !!
I have tried sending different AT commands after initialization process, however the module response is Error: 4.
Occasionally I get “OK” response if I type just “AT” 2 or 3 times but I get Error: 4 for any other commands.
Just to add, I have double checked power source and antenna and they are all fine.
Appreciate any help!
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