Tantos TSc-SD960HWZ18 (5-90) [22/26] 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 3 as the star configuration is not in conformity with the requirements of rs485 standards problems such as signal reflec tions lower anti interference performance arise when the cables are long in the conn ection 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

Tantos TSc-SD960HWZ18 (5-90) [22/26] 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 3 as the star configuration is not in conformity with the requirements of rs485 standards problems such as signal reflec tions lower anti interference performance arise when the cables are long in the conn ection 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
No action, no
video after
power up
Possible causesTrouble
Solution
9. 2 Trouble shooting
Power line connected wrong
Correct
Engineering line is malfunction
Self-testing and
image are normal
but the dome is
uncontrollable
The dome DIP switch setting
is incorrect
Refer to switch setting,reset the switch
Rs485 may carve out a way
Check Rs485connection, confirm
the connection is correct and
good in contact
Rs485 is in malfunction
Pls consult appendixRs485
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 resistance in the dome pan/tiltΩ
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.
9. 3 The cleaning of clear down cover
Check and repair
3 9
Appendix
Connection and termination resistor
The Rs485Bus standards require a daisy-chain
connection between the equipment. There must be
termination resistors with 120Ω(as the picture 9.4
-1). Please refer to picture 9.4-2 for simple
connection. D should not exceed 7m.
9.4 RS485Bus basic knowledge
120Ω
1# 2# 3# 4# 32#
Picture 9-4.1
120Ω
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 120Ω. 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.
12
1# 2# 3# 4# 32#
D
A+
B-
A+
B-
Picture 9.4-2
12
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 reflec
tions, lower anti-interference performance
arise when the cables are long in the conn
ection. 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).
RS 4 8 5 D i s t r i b ut or
B-
1#
2#
3#
120Ω
120Ω
120Ω
A+
120
120
120
Picture 9.4-4
4 0
Appendix

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