User Manual

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5.4 Problems in Actual Application
The star link mode will always be used in actual constructions, requiring the terminating resistor to
be linked with the two devices in the farthest distance. But it does not meet the requirements of the
RS485 industry standards. When the distance between each device are too long, signal reflection and
anti-interference ability reducing would frequently happen,which will decrease the reliability of the control
signal. It means the camera will not be under control or under control intermittently. In this case, the
application of RS485 distributor is recommended, which can effectively convert the star link mode to one
qualified by the RS485 industry standards. It will help avoid problems and improve the communication
reliability.
6.Trouble shootings
Troubles
Analysis
Solutions
PTZ S surveillance Camera
cannot be controlled by KBD
1.check RS485 cable
Step 1: Whether the RS485 A
and B are reversed, Step 2:
check whether the RS485 line is
short-circuited when power off.
2.check the correspondence of
camera protocol and baud rate
settings with those of KBD
Step 1: Check whether the
current protocol and baud rate
are correspondent.
Step 2: Restore the KBD default
settings and then reset it.
3.Check whether the PTZ
Step 1: If the PTZ indicator light