DWR-922 is a wireless router with QMI LTE embedded modem. It is pretty much identical to the D-Link DWR 921 C1/C3.
The DWR-922 only appears to differ from the DWR-921 in that there is an analogue RJ11 phone socket (not sure if supported, I didn't try), and the associated components on the board, which is unpopulated on the 921 board. This phone interface appears to also be used in the D-Link DWR-512.
The E2 hardware revision is the only one I have tested.
6x LED (GPIO-controlled); 1x bi-colour (red/green) Signal Strength LED (GPIO-controlled)
Opening the case
Remove 4 visible screws from the bottom of the unit. Carefully pull up on the top case from the back, ie insert your thumbnail in the small gap above the WAN port and gently pull up, the entire lid will pop off.
→ port.serial general information about the serial port, serial port cable, etc.
How to connect to the Serial Port of this specific device:
UART header on PCB, labelled “J1”, on the right side of the board.
Serial connection parameter
The status led has been assigned to the dwr-922-e2:green:sigstrength (LTE signal strength) led. At the end of the boot it is switched off and is available for LTE operation. Works correctly also during sysupgrade operation.
Can be configured in uci/LuCI by setting:
LED Name: dwr-922-e2:green:sigstrength
Default state: (off)
Trigger Mode: Link On