Eaton ProtoAir Start-Up Guide
Page 11 of 66
4
INTERFACING PROTOAIR TO DEVICE
4.1 Wiring Field Port to RS-485 BMS Network
Connect the RS-485 network wires to the 3-pin RS-485 connector on ProtoAir FPA-W34 as
shown in
o
Use standard grounding principles for RS-485 GND
See
Section
for information on connecting to BACnet/IP network.
If the ProtoAir is the last device on the Serial trunk, then the End-Of-Line Termination Switch
needs to be enabled. (
o
The default setting from the factory is OFF (switch position = left side)
o
To enable the Termination, turn the EOL switch ON (switch position = right side)
BMS
Wiring
ProtoAir
Pin #
Pin
Assignment
RS-485 +
Pin 1
RS-485 +
RS-485 -
Pin 2
RS-485 -
-
Pin 3
RS-485 GND
Termination Resistor
DIP Switch (1)
Figure 6: Termination DIP Switch
Figure 5: Connection from ProtoAir to RS-485 Field Network
G
-
+