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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
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