Control Panel User Manual
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3. To eliminate signal attenuation in communication cables and suppress
interference, if the bus is longer than 300 meters, one 120ohm resistance is
usually inserted between the first and last access control operator panels on the
RS485 bus.
4. For this access control operator panel, putting place 8 of the DIP switch to the
ON position is equivalent to parallel connection of one 120ohm resistance
between the 485+ and 485- lines.
As shown in the figure below, put place 8 of the DIP switches of the first and last
control operator panels to the ON position.
Figure 4-2 RS485 Communication System Networking
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