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Rev 1.00 12 Document 900.0259
10/04
Installation
P
Table 2-3 9-Pin COM Port Pinouts
Pin Type Function
1 RS232-TX:
RS232
The HRTL-One can be controlled remotely by an external device or control system
(for example, a control keyboard), using RS-232 serial communications signals. See
RS-232/RS-485 Remote Protocol, page 30.
2 RS232-RX:
RS232
The HRTL-One can be controlled remotely by an external device or control system
(for example, a control keyboard), using RS-232 serial communications signal.
3 Video loss If video loss occurs, the system sends a signal to trigger another accessory. This pin
output becomes Low when video loss occurs, and remains High under normal
operation.
4 Switch out Connect to the VCR trigger recording terminal of the multiplexer to synchronize
recording signals. The default mode is falling (negative) edge.
5 Error out This pin becomes Low when hard drive errors occur and remains High under normal
operation.
6 Rec start This pin can accept the external trigger signal to activate record mode from an
external device. Options are:
Low: (default) When the external signal turns to Low it triggers the HRTL-One record
mode.
High: When the external signal turns back to High the HRTL-One stops recording.
7 External alarm
NC
Under normal operation, COM (pin 15) connects with NC and disconnects with NO
(pin 8).
When an alarm is triggered, COM disconnects with NC and connects with NO.
8 External alarm
NO
Under normal operation, COM (pin 15) connects with NC and disconnects with NO
(pin 7).
When an alarm is triggered, COM disconnects with NC and connects with NO.
9GND Ground
10 RS-485-B The HRTL-One can be controlled remotely by an external device or control system
(for example, a control keyboard) using RS-485 serial communication signals.
11 RS-485-A The HRTL-One can be controlled remotely by an external device or control system
(for example, a control keyboard) using RS-485 serial communication signals.
12 Disk full Under normal operation the state remains High.
When the disk is full, the HRTL-One sends a Low state.
Example:
When the hard drive is full and you have installed another HRTL-One recorder, a
signal can be sent to the next HRTL-One to activate recording.