IC Realtime ICIP-P2012T Product Manual - Page 26

Figure 7-2 7.4 RS485 Bus FAQ Phenomenon Speed dome can run selfdiagnosis but I can not control it. I can control the speed dome but is not smooth Possible Reasons 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 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. Solution z Modify host or speed dome setup ； z Switch RS485 positive end and negative end； z Fix connection cable firmly； z Replace RS485 Bus. z Connect RS 485 Bus again； z Replace RS485 Bus； z Add terminal matching resistance； z Add RS485 distributor. 18