LAARS’ ProtoNode Startup Guide
Page 19 of 43
3.3 BACnet MS/TP or Metasys N2 (FPC-N34): Wiring Field Port to BMS Network
•
For BACnet/IP see
Section 4
for information on connecting to BACnet/IP network
•
Connect the BACnet MS/TP or Metasys N2 RS-485 network wires to the 3-pin RS-485
connector on ProtoNode FPC-N34 as shown below in
Figure 12
.
o
The RS-485 GND (Pin 3) is not typically connected.
•
If the ProtoNode is the last device on the BACnet MS/TP or Metasys N2 trunk, then the
End-Of-Line Termination Switch needs to be enabled (
Figure 13
).
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).
3.4 LonWorks (FPC-N35): Wiring Field Port to LonWorks Network
•
Connect ProtoNode to the field network with the LonWorks terminal using a twisted pair non-
shielded cable. LonWorks has no polarity.
BMS RS-
485 Wiring
ProtoNode
Pin #
Pin
Assignment
RS-485 +
Pin 1
RS-485 +
RS-485 -
Pin 2
RS-485 -
-
Pin 3
RS-485 GND
Figure 14: LonWorks Terminal
End-of-Line Switch
Figure 13: RS-485 BMS Network EOL Switch
G
-
+
Figure 12: Connection from ProtoNode to RS-485 Field Network
The LAARS Gateway LER and RER Startup Guide
Page 19 of 43
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•
(800) 900-9276
•
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