Clover HDV043 Instruction Manual page 18

Optional Alarm Sensor Extension Box
There is an optional Alarm Sensor Extension Box that connects to RS-232 port provided in
our DVR unit..
① Power switch
② Power adaptor connector
③ RS-232 port (Port connected to the system)
④ Sensor input (1~16)
⑤ Normal Open alarm output : 1~16
⑥ Normal Close alarm output : 1~16
Figure 8 Connection Example of Extension Box
Sensor 1~16 inputs functions same as the S1~S4 inputs (see next section in 10-way terminal
Block). Difference is that every port is issued with its own ground connection located right
below. Additionally there are 16 NO (Normally Open) dry contact points with dedicated
ground and 16 NC (Normally Closed) dry contact point with dedicated ground per points.
These NO, NC points are used in Access control integration.
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