CBC V 0.1 - Manual (Page 12)

12
9 pin com port
PIN 1. RS232-TX : RS-232
DVR can be controlled remotely by an external device or control system, such as a
control keyboard, using RS-232 serial communications signals.
PIN 2. RS232-RX : RS-232
DVR can be controlled remotely by an external device or control system, such as a
control keyboard, using RS-232 serial communications signals.
PIN 3. VIDEO LOSS
When video loss happen, it will send a signal to trigger another accessory.
This pin output becomes “Low” when video loss, and normal operation remains “High”