Installation guide

Figure 8-2

8.4 RS485 Bus FAQ

Phenomenon Possible Reasons Solution

Speed dome

can run self-

diagnosis but I

can not control

it.

z Host address(baud rate) and

speed dome address(baud rate)

are not match;

z Positive and negative end of

RS485 Bus are misconnected;

z Connection cable is loose；

z RS485 Bus connection are cut

off;

z Modify host or speed dome setup ；

z Switch RS485 positive end and

negative end；

z Fix connection cable firmly；

z Replace RS485 Bus.

I can control

the speed

dome but is not

smooth

z RS485 Bus connection are not

good；

z One RS485 bus is off；

z The distance between host and

speed dome is too far；

z Parallel connected too much

speed domes.

z Connect RS 485 Bus again；

z Replace RS485 Bus；

z Add terminal matching resistance；

z Add RS485 distributor.

Note

• This manual is for reference only. Slight difference may be found in the user

interface.

• All the designs and software here are subject to change without prior written

notice.

• If there is any uncertainty or controversy, please refer to the final explanation of us.

• Please visit our website or contact your local service engineer for more

information.