Honeywell HD-16DVR-C, User Manual

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Installation and Connections
22
Surge voltage
Between touches with same
polarity
1500V (10×160us)
Length of open time 3ms max
Length of closed time 3ms max
Mechanical 50×106 times (3Hz)
Longevity
Electrical 200×103 times (0.5Hz)
Temperature -40 ~
℃
+70
℃
RS232
RS232 port is reserved for technical support diagnosis and upgrade.
RS485
When the DVR receives a camera control command, it transmits that
command up the coaxial cable to the PTZ device. RS485 is a single-
direction protocol; the PTZ device cannot return any data to the unit. To
enable the operation, connect the PTZ device to the RS485 (A,B) input on
the DVR. See
Figure 3-3 .
Since RS485 is disabled by default for each camera, you must enable the
PTZ settings first. This series DVRs support multiple protocols such as
Pelco-D, Pelco-P.
To connect PTZ devices to the DVR:
1. Connect RS485 A,B on the DVR rear panel.
a. Ensure the decoder has the same grounding with the DVR,
otherwise you will not be able to control the PTZ. Shielded twisted wire
is recommended, and the shielded layer should be used to connect the
ground.
b. Avoid high voltage. Ensure proper wiring and some thunder
protection measures.
c. For signal wires that are too long, 120 Ω should be connected parallel
between A, B lines on the far end to reduce reflection and guarantee
signal quality.
d “485 A, B” of DVR cannot connect parallel with “485 port” of other
device.