sim7000 NB-IoT Expansion Shield FAQ【DFR0572/DFR0505】
Q1:The serial monitor shows that the card is on turn on SIM7000...
A1:1. Check whether an external power supply is connected. Input Voltage: 7-12VDC (VIN range: 6-20V). The micro USB port of the Sim7000 expansion board cannot be used for power supply, but for burning firmware.
2. Try to replace the external power adapter/lithium battery.
3. Try to manually turn on the SIM7000, press and hold the Boot button for 2 seconds.
Q2: Fails to attach the service
A2:1. Please check the signal strength, use AT command to check the signal strength, if there is no signal or the signal is too poor, change the place/change the antenna.
2. Try to change the network standard (according to the sim card type), setNetMode NB to GPRS.
3. Try attaching the service manually, using AT commands.
Q3:Is it available in a certain region?
A3:It needs to be determined according to the frequency band provided by the local operator.
If you have other questions, just feel free to post them in our forum for consultation. We will reply them as soon as possible and improve the product FAQ gradually.