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# BGS2-E Rel 4.5 Problems | Thales IoT Developer Community

March 14, 2022 - 11:17am, 309 views

Hello,

I am switching from and older BGS2-E modem (Rel 1) to a new versions (Rel 4.5) when I try and initialize the modem using the same commands everything seems to work (i.e. the AT commands get the OK response) but the the AT^SISO command I get error code 100 which is the unknown error.

I have text files that show that the AT commands are the same in both cases but it will take a lot of space so haven't posted them but I can if it will help.

Can anyone explain what is going wrong please?

Regards

Stephen