Connecting The R1 & R2 Ports; Wiring - MSA ProtoNode FPC-N54 Startup Manual

3.2 Connecting the R1 & R2 Ports
For the R1 Port only: Switch between RS-485 and RS-232 by moving the number 4 DIP Switch left for RS-485 and right
for RS-232 (see images in Section
The R2 Port is RS-485.
Connect to the 3-pin connector(s) as shown below.
The following baud rates are supported on the R1 and R2 Ports:
9600, 19200, 38400, 57600, 76800, 115000
NOTE: Not all baud rates listed are supported by all protocols. Check the specific protocol driver manual for a
list of the supported baud rates.

3.2.1 Wiring

NOTE: The RS-485/RS-232 is part of the RS-485/RS-232 interface and must be connected to the corresponding
terminal on the BMS. If the cable is shielded, the shield must connected only at one end and to earth ground –
it will help suppress the electromagnetic field interference. (Connecting the shield at both ends will likely
produce current loops, which could produce noise or interference that the shield was intended to block).
3.1 DIP Switch Settings).
RS-485
BMS Gateway Pin
RS-485 Wiring Assignment
RS-485 + TX +
RS-485 - RX -
GND GND
ProtoNode Start-up Guide
RS-232
BMS Gateway Pin
RS-485 Wiring Assignment
RS-232 - TX +
RS-232 + RX -
GND GND
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