Alarm Input And Output Details - Q-See QC40198 User Manual

INSTALLATION & CONNECTION
How to connect PTZ camera
a. Ensure the camera has the same grounding with combo DVR otherwise you may not control the PTZ. Shielded
twisted wire is recommended and the shielded layer is used to connect to the ground.
b. For excessively long signal wires, 120Ω should be parallel connected between A, B lines on the far end to
reduce reflection and guarantee the signal quality.
c. 485 A, B" of combo DVR cannot parallel connect with "485 port" of other device.
d. The voltage between of A, B lines of the camera should be less than 5v.
e. Ensure the front end device is soundly grounded. Improper grounding may result in chip damage.

3.7.1 Alarm Input and Output Details

You can refer to the following chart and Figure 3-7 for alarm input and output information.
Parameter
Alarm Input
1-NO C，
2-NO C，
CTRL 12V
A/B
Figure 3-7
Grounding Alarm
Ground line
1, 2, ..., 8 becomes valid in low voltage.
Two NO activation outputs.
Controls the power output
You need to close the device power to cancel the alarm.
485 communication port. Used to control devices such as PTZ.
Please parallel connect 120Ω between A/B cables if there are too
many PTZ cameras
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QC40198 User Manual
AB Connection
port