ProtoCessor ProtoNode LER, Startup Manual, Page: 13 / 38

Harsco Industrial Patterson-Kelley ProtoNode Startup Guide Page 13 of 38
ProtoCessor 1991 Tarob Court Milpitas, California 95035 USA Web : www.protocessor.com
Tel : (408) 964 4444 Fax : (408) 964 4425 Toll Free : (800) 317 8319 email : support@protocessor.com
Figure 8: Modbus RS-485 Biasing Switch on the ProtoNode N34 (left) and ProtoNode N35 (left).
3.2.3 End of Line Termination Switch for the Modbus RS-485 port on the ProtoNode

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, you turn the Blue RS-485 End-of- Line
Terminating switch to ON position.

On short cabling runs which most of the ENVI applications are, the EOL switch does not to need to be
turned ON. The default setting for this Blue EOL switch is OFF.

All ways leave the single Red Jumper in the A position.
Figure 9: Modbus RS-485 End-Of-Line Termination Switch on the ProtoNode N34 (left) and ProtoNode N35 (right)
RS-485 Bias Switch
RS-485 Bias Switch
Modbus RS-485 EOL Switch
Switch
Modbus RS-485 EOL Switch
EOLEOL Switch
Leave in A Position