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    Topics created by Edward9284

    • E

      Interpreting a 4G LTE module output, $QCNETDEVCTL: 0/1
      Hardware • sim7670 simcom • • Edward9284

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      E

      I have been having problems diagnosing why a SIM7670G 4G LTE module board keeps loosing service and failing after a couple hours.

      It is displaying these codes:
      $QCNETDEVCTL: 0
      $QCNETDEVCTL: 1

      My searches get no results, SimCom tech support is not responding.

    • E

      SIM7670G problems, failures, US. Core board issues?
      Hardware • sim7600 sim7670 • • Edward9284

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      Unlike the SIM800L I have experience with, a SIM7670G core board I’m testing stops responding to commands via UART and to incoming SMS messages after operating perfectly for a few hours, and definitely overnight. The odd thing is, when the SIM7670G core board is connected by USB to a PC(and monitored in Putty or without Putty running) during multi-day tests, it does not fail.

      4GLTEcb.jpg

      This is not occurring with a SIM7600NA core board I’m also testing, it maintains a persistent connection to the 4G LTE network and never fails.

      Both boards are being tested with 9VDC 3 amp power adapters, with a 470uf cap in parallel.

      Why might this SIM7670G board need the USB connected to a power source? Not getting any specific support from the supplier.

      Could it just be a defective board?
      Has anyone else experienced this?

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