USR-GPRS232-DTU USR MANUAL
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Jinan USR IOT Technology Limited
7 FAQ
Module does not send a message to the serial port after power
1. Check the power supply module is normal: POW lights lit, NET lights flashing.
2. Check the serial connection is normal: cable good contact.
3. Other parameters to check the serial debugging assistant opened the serial number is consistent with the actual
serial port.
4. Open the serial port using a serial debugging assistant, re-energized to DTU module to observe whether there is
return information.
5. if you use the setup software no return, use debugging assistant to return, the setup software / current port does
not work in the current computer, try to replace a computer or serial retesting.
Module constantly reboot
1 constantly restart performance.
2 Check the power supply is normal: Recommended use 12V / 1A power supply.
3 to confirm whether connected to the antenna, in the absence of the antenna, the difference signal quality easily
lead to the restart.
4 Confirm SIM card is inserted, SIM card is normal. If the module does not recognize the SIM card, the module
will restart.
