Do you have the ignition sensor wire connected?
If you are using the router in a vehicle then connect the ignition sensor to an accessory positive wire.
If you are using the TX54 on your desk then add a jumper wire between the positive and ignition sensor.
https://www.digi.com/resources/documentation/digidocs/90002357/default.htm#device/transport/transport-power-connector-r.htm
That should fix it.
Nicholas Wilson
Your IoT
https://www.YourIoT.com.au