Bacnet Ms/Tp, Modbus Rtu, Metasys N2: Wiring Field Port To Rs-485 Network; Figure 6: Connection From Protocessor To Rs-485 Field Network; Figure 7: Rs-485 Bms Network Eol Switch - SMC Networks ProtoCessor FPC-ED2 Startup Manual

4.2 BACnet MS/TP, Modbus RTU, Metasys N2: Wiring Field Port to RS-485
Network
•
Connect the BACnet MS/TP, Modbus RTU or Metasys N2 RS-485 network wires to the 3-pin RS-
485 connector on ProtoCessor ED2 as shown below in
o
Use standard grounding principles for RS-485 GND
•
See Section 5.5
network.
BMS RS-
485 Wiring
RS-485 +
RS-485 -
-
•
If the ProtoCessor is the last device on the BACnet MS/TP, Modbus RTU or Metasys N2
trunk, then the End-Of-Line Termination Switch needs to be enabled
o
The default setting from the factory is OFF (switch position = right side)
o
To enable the EOL Termination, turn the EOL switch ON (switch position = left
side)
for information on connecting to BACnet/IP and Modbus TCP/IP
ProtoCessor Pin
Pin # Assignment
Pin 1 RS-485 +
Pin 2 RS-485 -
Pin 3 RS-485 GND

Figure 6: Connection from ProtoCessor to RS-485 Field Network

Figure 7: RS-485 BMS Network EOL Switch

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Leonard Valve ProtoCessor Start-up Guide
Figure 6.
-
G
(Figure
End-of-Line Switch
7).