I'm interested in upgrading the telemetry system from 900 Mhz to a 3G system.
Is it possible to have a SIGMA MCU Elite talk to a non PI data modem. Essentially, I just want a power in, rx, tx and a ground line.
Is there a need for carrier detect? Or can you simulate this in the sigma to send data after a certain time from powering up the car.

So far I have tried to connect as explained which gives signal suggesting the modem will connect, however no data is transmitted.

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