Network connection issues

Condition

The XBee 3 Cellular LTE-M/NB-IoT is not joining the network, AI (Association Indication) is cycling between 0xFF (Initalizing), 0x22 (Registering to Cellular Network) and 0x25 (Cellular Network Registration Denied).

Solution

Some things to check are:

• The antennas are connected correctly to the device.
• The SIM card is seated properly in the device.
• Use ATRJ to view the reject cause.
• APN is set correctly.

• If you are using a SIM card not provided by Digi, or a SIM card capable of roaming between multiple networks, you may need to adjust the modem’s network configuration. Set ATCP to 1 (No Profile), and set ATBM and/or ATBN to select only the bands supported by the carrier you wish to connect to. Consult with your carrier to determine the necessary bands.

• If you had to change a modem parameter, check to make sure you have reset the module using the FR command or by pressing the reset button, especially if you have changed settings such as CP, N#, BM, or BN.

Note The default APN configured in the kit should allow the XBee 3 Cellular LTE-M/NB-IoT to get on the network with the SIM included in the kit. However, you may program the APN explicitly to 10569.mcs if you are having difficulty registering with the network.