4 rs485 bus faq – IC Realtime 3Mp Full HD Network PTZ Dome Camera (ICIPP3020HD) User Manual
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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.