I can see the SEM is powered and communicating with ADC. It is responding to commands we are sending, but it appears it cannot communicate with the alarm panel.
Try powering down the SEM and alarm panel, then remove the wiring for the SEM from the panel, cut the exposed wire, then strip back the sheath to reveal fresh wire and reconnect to the panel. This will address any possible loose wiring or broken strands, etc., that might be causing an issue. Wouldn’t be a bad idea to reattach the wiring at the SEM as well just in case. After power up, if it can communicate with the panel, it should initiate a zone scan.