AERCO XPC GATEWAY Communications - Manual (Page 55)

GF-122 AERCO XPC GATEWAY
55
3.3 INTERFACING THE XPC GATEWAY TO BMS II, MODEL 5R5-384
The BMS II (Model 5R5-384) contains an internal RS232 port which provides Modbus connections to the
XPC Gateway. In addition, the BMS II contains an internal RS485 port which provides monitoring and
control of the Boilers connected to the BMS II. These internal RS232 and RS485 ports are located on the
terminal board behind the wiring compartment cover of the BMS II. These locations and connector
pinouts for these ports are shown in Figures 3-9 and 3-10.
SENSORS
& 4-20 mA
INTERLOCKS
& SETBACK
RS485
& RS232
AC POWER RELAYS
Figure 3-9. BMS II With Wiring Compartment Cover Removed