Maxtor Digital Video Recorder CBC V 0.4 - Manual (Page 13)

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”
PIN 4. SWITCH OUT
Connect to VCR trigger recording terminal of multiplexer, in order to synchronize
recording signals. The default mode is falling (Negative) Edge.
PIN 5. ERROR OUT
When HDD errors happen, this pin will send a signal out.
This pin becomes “Low” when HDD errors happen. The normal operation remains
“High”
PIN 6. REC START
This pin can accept the external trigger signal to activate record mode from
external device. When the external signal turn to “Low”, it will trigger DVR record
mode. When the external signal back to “High”, it will stop recording action.
The default normal operation remains “High”.
PIN 7. EXTERNAL ALARM NC
Under normal operation COM connect with NC and disconnect with NO. But when
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