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End-of-line switch
Figure 15: RS-485 EOL switch
Figure 14: Connection from ProtoNode to RS-485 field protocol (BACnet MS/TP)
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
3.3 - Wiring ProtoNode RER to RS-485 field protocol
The following shows how to wire ProtoNode RER to RS-485 field protocol (BACnet MS/TP or Metasys N2).
•
Connect the BMS BACnet MS/TP or Metasys N2 RS-485 port to the 3-pin RS-485 connector on ProtoNode RER as shown below.
•
See Section 4.1 for information on connecting ProtoNode RER to the BACnet/IP network.
•
If the ProtoNode is the last device on the BACnet MS/TP or Metasys N2 trunk, the end-of-line terminator must be enabled (see
Figure 15). It is disabled by default.
Figure 13: Modbus RS-485 end-of-line termination switch on the ProtoNode N34
Leave in A position
Modbus RS-485 EOL switch
3.2.2 - 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 end of the trunk, turn the blue RS-485 end-of-line terminating switch to the 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.
• Always leave the single red jumper in the A position.
3 - Interfacing ProtoNode to Devices (cont.)
