Speco Technologies DVR-T4IP - Manual (Page 22)

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1.4.1.3 Audio : support or not support
Use IN for a Line input and OUT for speaker output.
1.4.1.4 RS-232
Use this connector to connect RS-232 cable to the serial port on your PC to control the
DVR or to perform Quick Installation.
1.4.1.5 PTZ/AUX/ALARM
1.4.1.5.1 RS-485+, RS-485-
DVR-T4IP uses RS-485 protocol to control PTZ Receiver, Speed Dome, and Auto-focus
camera. Be sure to match the polarity.
1.4.1.5.2 AUX 1~5
AUX Port consists of 2 input ports (AUX 1,2) and 3 output ports (AUX 3,4,5) and the function
of each port is selectable according to user’s purpose, user’s access to external DVR, or
controllers using the supplied DB-15 connector.
1.4.1.5.3 Alarm Out (NO, COM, NC)
The Alarm output is activated using a relay contact point when an alarm event occurs for the
duration of the alarm event.
Select from Normal Open Relay or Normal Close Relay.
N.O. (Normal Open) is disconnected from COM during normal status and connected to COM
during alarm event. N.C (Normal Close) is connected from COM during normal status and
disconnected to COM during alarm event.