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E204701
2-13
2: Using the ProtoCom/ProtoCom-Lon
2.6.2: Set End of Line Termination Switch for the Modbus RS485 Port
(only if necessary)
On long RS485 cabling runs, the RS485 trunk must be properly terminated at each
end. The ProtoCom has a blue End-of-Line (EOL) terminating switch (see the figure
below). On short cabling runs the EOL switch does not to need to be turned ON;
therefore the default setting for this ProtoCom’s EOL switch is OFF. Refer to Section
1.8 for instructions on removing and replacing the unit’s top cover.
If the ProtoCom is placed at one of the ends of the trunk on a long RS485 cabling run,
turn the Blue RS485 End-of- Line Terminating switch to the ON position.
Figure 2.7: EOL Termination Jumpers
IMPORTANT!
Do not touch any other parts of the main board.
To turn the EOL switch
ON, move the blue
jumper down so that it
covers these 2 pins