Connecting The R1 & R2 Ports; Wiring; Supported Rs-485 Baud Rates By Protocol - MSA QuickServer FS-QS-3 0-F Series Operating 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.

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).

3.2.2 Supported RS-485 Baud Rates by Protocol

The supported baud rates for either port is based on the protocol of the connected devices.
The following baud rates are supported for Modbus RTU:
2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200
The following baud rates are supported for BACnet MS/TP:
9600, 19200, 38400, 76800, 115200
3.1 DIP Switch Settings).
RS-485
BMS Gateway Pin
RS-485 Wiring Assignment
RS-485 + TX +
RS-485 - RX -
GND GND
QuickServer Start-up Guide
RS-232
BMS Gateway Pin
RS-485 Wiring Assignment
RS-232 - TX +
RS-232 + RX -
GND GND
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