Issues on COM-Communication with Qualcomm SURF-xxxx

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im a Student worker for a automobile r&d Company. Im currently working on a Java application that is workling like QXDM but also offers additional Features. I'm stuck with the communication over the DM (Diagnostic mode) port. I tried to use PuTTy for that. Putty and also my application were able to connect to that Port. Now since I got the official dmss documentation, im still not able to get a reply on that port. Do you guys have had the same Problem or at least a similar one and may provide me some help finding the issue? To Switch the phone in diagnostic mode there is a AT-Command. But even though if I connect via puTTy and write down the command, I dont get a reply in putty neither the following diagnostic requests will work.

Does anyone know how to use puTTy to give AT Commands?

The Qualcomm device is connected via USB Dongle using Telit Drivers. Using Telit Serial Diagnostics Interface COM Port.

Using QXDM everything is working fine.

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