beautypg.com

IC Realtime 600TVL / 650TVL 36X High Speed PTZ Camera with 260ft User Manual

Page 38

background image

31

conform to RS485 Bus standard. When the distances between devices are too long, the signal reflection

occurs and anti-jamming decreases, thus the signal reliability becomes very low. You can see speed dome

is not under control or speed dome is running automatically and can not stop.

Figure 7-3

In this situation, we recommend RS485 distributor. This device can turn star type connection into the

connection that conforms to RS485 bus industry standard, which can avoid the above mentioned problems

and enhance communication reliability. See Figure 7-4.

Figure 7-4

7.5

7.5

7.5

7.5

RS485 Bus FAQ

RS485 Bus FAQ

RS485 Bus FAQ

RS485 Bus FAQ

Phenomenon

Possible Reasons

Solution

Speed dome
can run self-
diagnosis but I
can not control
it.

Host address(baud rate) and
speed dome address(baud rate)
are not match;

Positive and negative end of
RS485 Bus are misconnected;

Connection cable is loose

RS485 Bus connection are cut
off;

Modify host or speed dome setup

Switch RS485 positive end and
negative end

Fix connection cable firmly

Replace RS485 Bus.

I can control
the speed
dome but is not
smooth

RS485 Bus connection are not
good

One RS485 bus is off

The distance between host and
speed dome is too far

Parallel connected too much
speed domes.

Connect RS 485 Bus again

Replace RS485 Bus

Add terminal matching resistance

Add RS485 distributor.

This manual is related to the following products: