No action, no
video after
power up
Possible causes
Trouble
Solution
8 Trouble shooting
Power line connected wrong
Correct
Engineering line is malfunction
Self-testing and
image are normal
but the dome is
uncontrollable
The dome ID setting
is incorrect
Refer to ID setting
Rs485 may carve out a way
Check Rs485connection, confirm
the connection is correct and
good in contact
Rs485 is in malfunction
Pls consult appendix
“
Rs485
Bus acknowledge
”
Video image
is not steady.
Video line is bad connection
Eliminate
Power consumption is not enough
Video image is
not steady and the
motor is faulted
Power consumption is not enough
Replace the power
Dome controlling
is not smooth.
Controlling line connected
wrong, or Rs485 loads too
much or the distance of
communication is too far
1.Connect 120
Ω
resistance in the dome pan/tilt
that is far from the controller
2.Increase distributor
Power supply is damage or
power consumption is not
enough
Replace
Replace right power adapter, it is better to put
the switch and power adapter near the dome
To obtain constant clear videos, user should
clean the down cover periodically.
●
Be caution when cleaning, hold the down cover
ring only to avoid direct touch to the acrylic down
cover. The acid sweat mark of fingerprint will corrode
the coating of down cover and scratch on down cover
will cause vague image.
●
Use soft dry cloth or the substitute to clean the inner
and outer surfaces
●
For hand contamination, use neutral detergent. Any
cleanser for high grade furniture is applicable.
8.1 The cleaning of clear down cover
Check and repair
Appendix
Connection and termination resistor
The Rs485Bus standards require a daisy-chain
connection between the equipment. There must be
termination resistors with 120
Ω
(as the picture 9.4
-1). Please refer to picture 9.4-2 for simple
connection. D should not exceed 7m.
8.2 RS485Bus basic knowledge
120
Ω
1# 2# 3# 4# 32#
Picture 9-4.1
120
Ω
2400bps
4800bps
9600bps
1800m
1200m
800m
Baud rate
Max distance
19200bps
600m
As specified by Rs485 standard, Rs485 Bus
is of half-duplexed data transmission cables with
characteristic impedance as 120
Ω
. The maximum
load capacity is 32unit loads(including main
controller and controller equipment)
Characteristics of Rs485 Bus
Transmission distances of Rs485 Bus
When user selects the 0.56mm(24AWG) twist
pair wires as data transmission cable, the max
theoretical transmitting distance are as follows:
If user selects thinner cables, or installs the
dome in an environment with strong electroma-
gnetic interference, or connects lots of equipment
to the Rs485Bus, the max transmitting distance
will be decreased. To increase the maximum
transmitting distance, do the contrary.
120Ω
1# 2# 3# 4# 32#
D
A+
B-
A+
B-
Picture 9.4-2
120Ω
Problems in practical connections
In some circumstances user adopts a star
configuration in practical connection. The
termination resistors must be connected to
the two equipment 1# and 15# in picture 9.4-3.
As the star configuration is not in conformity
with the requirements of RS485 standards,
problems such as signal reflections, lower
anti-interference performance arise when
the cables are long in the connection. The
reliability of control signals is decreased
with the phenomena that the dome does not
respond or just responds at intervals to the
controller, or does continuous operation
without stop.
1#
32#
15#
6#
Main controller
Picture 9.4-3
120
120
In such circumstances the factory reco-
mmends the usage of RS485 distributor.
The distributor can change the star config-
uration connection to the mode of connection
stipulated in the RS485 standards. The new
connection achieves reliable data transmi-
ssion (Refer to Picture 9.4-4).
RS485 Distributor
B-
1#
2#
3#
120
Ω
120
Ω
120
Ω
A+
120
120
120
Picture 9.4-4
17
Appendix
18
