Camus ProtoNode Start-up Guide
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4.6.1 Biasing the RS-485 Device Network
•
An RS-485 network with more than one device needs to have biasing to ensure proper
communication. The biasing only needs to be done on one device.
•
The ProtoNode has 510 ohm resistors that can be used to set the biasing. The ProtoNode’s default
positions from the factory for the biasing jumpers are OFF.
•
The OFF position is when the 2 red biasing jumpers straddle the 4 pins closest to the outside of
the board of the ProtoNode. (
•
Only turn biasing ON:
o
IF the BMS cannot see more than one device connected to the ProtoNode
o
AND all the settings (COM settings, wiring, and DIP switches) have been checked
•
To turn biasing ON, move the 2 red biasing jumpers to straddle the 4 pins closest to the inside of
the board of the ProtoNode.
RS-485 Bias
Switch
(off)
Figure 11: RS-485 Biasing Switch on the ProtoNode N34 (Left) and ProtoNode N35 (Right)
