Lonny Knudson.
Charith MendisI have recently bought Multitech MTSMC-G2 from Digikey.
http://www.digikey.com/product-detail/en/MTSMC-G2/591-1113-ND/2164038
AT commands are working fine. But when the SIM is entered it does not get registered with the network.
AT+CPIN? returns ready signal. So I think the SIM is entered correct. I am from Sri Lanka.
Is there special hardware requirements or commands that I should use to setup the GSM modem for my network. My network is Mobitel in Sri Lanka.
Lonny KnudsonCheck the band selection setting (AT+WMBS?). I did a quick search on the web and it looks like Mobitel uses the 1800Mhz band for 2G services (you may want to verify this with the carrier). If this is correct, I would suggest trying +WMBS=5 or +WMBS=2.
Here is a link to the AT command manual, see page 79 for +WMBS options and syntax.
http://www.multitech.com/en_US/DOCUMENTS/Collateral/manuals/S000463F.pdf
Charith MendisThank you very much it worked when I selected 5.
Also, another query; I couldn’t find whether the reset pin of the module is active low or active high in any data sheets. Can you verify whether it is active high or low?
Also, whether it is internally pulled up or down?
Lonny KnudsonReset pin has internal pull-up, to initiate a hardware reset drive signal to 0V and release. I believe signal needs to be pulled low for 100uS (check developer guide to confirm).
If you don’t already have a copy, you can obtain the hardware developer guide for the Universal Socket products by following the link below and filling out the form.
http://www.multitech.com/en_US/TOOLS/Forms/DynamicForms/EnterData.aspx?ID=4