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leaving transparent mode with DTR line toggling unreliable | Telit Cinterion IoT Developer Community

July 5, 2019 - 9:15am, 6375 views

Our scenario is that we enter transparent mode to a server, send some data and close transparent mode to communicate with some other host, etc. We use DTR line toggling to escape from transparent mode. Now it seems that *some****** the modem becomes unresponsive after toggling the line. My assumption here is that the modem either some***** stops/halts or transparent mode remains on. Any idea which? The symptom is that issueing a command such as ATI in the error case does not respond  *at all*.

- Is there a guidance for how long we should keep the DTR line high?

- it seems more reliable if we toggle the DTR line multiple *****? Is this true?

Note: ATI1 gives: Cinterion||PLS8-E||REVISION 03.017||A-REVISION 01.000.05||||OK in the normal case.