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Installation / User’s Guide
27
7. RS-485 Bus Matching Resistance
For better centralized control, a matching resistance should be set in parallel via RS-485
interface at the speed dome that is farthest from the center controller. By doing this, those
signal reflection and interference from the RS-485 signal and the like can be cleared up.
There is a switcher for controlling of the matching resistance at the end of SW202 on the
PCB board. And the matching resistance is connected to the RS-485 cable when the “No. 8”
switcher is set to “ON” status.
Note
◆
When dome is out of control or doesn’t work under RS-485 BUS control status,
please set switch of matching resistance as ON status; so that it can clear up bad
phenomenon.
◆
If dome address, baud rate and communication protocol is required to be reset after
finish installation, please ensure dome is at power off status.
Protocol
Baud Rate
Restore
Daisy Chain
Matching Resistance
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