End Of Line Termination Switch For The Modbus Rs-485 Device Network - FieldServer LonWorks ProtoNode Instruction Manual

Figure 3-2: Modbus RS-485 Biasing Switch on the ProtoNode
3.2.2 End of Line Termination Switch for the Modbus RS -485 Device Network
•
The ProtoNode has an End Of Line (EOL) blue jumper. The default setting for this Blue EOL
switch is OFF with the jumper straddling the pins closest to the inside of the board of the
ProtoNode.
o On short cabling runs the EOL switch does not need to be turned ON.
o On long RS-485 cabling runs, the RS-485 trunk must be properly terminated at each
end.
•
If the ProtoNode is placed at one of the ends of the trunk, set the blue EOL jumper to the ON
position straddling the pins closest to the outside of the board of the ProtoNode.
•
Always leave the single Red Jumper in the A position (default factory setting).
Figure 3-3: Modbus RS-485 End-Of-Line Termination Switch on the ProtoNode
Page 13 of 97 PN: 106417-05