Siemens ProtoAir FPA-W44 - Wiring Field Port to RS-485 Serial Network; Figure 7: Connection from Protoair to RS-485 Field Network

Siemens ProtoAir Start-up Guide
Page 12 of 66
4.2 Wiring Field Port to RS-485 Serial Network
• Connect the RS-485 network wires to the 3-pin RS-485 connector on the R2 port. (Figure 7)
o Use standard grounding principles for RS-485 GND
• See Section 5 for information on connecting to an Ethernet network.
BMS
Wiring
ProtoAir
Pin #
Pin
Assignment
RS-485 +
Pin 1
RS-485 +
RS-485 -
Pin 2
RS-485 -
-
Pin 3
RS-485 GND
Figure 7: Connection from ProtoAir to RS-485 Field Network
G
-
+