AERCO XPC GATEWAY Communications - Manual (Page 47)

GF-122 AERCO XPC GATEWAY
47
SECTION 3 INTERFACING THE XPC TO BOILER MANAGEMENT SYSTEMS
3.1 INTRODUCTION
The XPC Gateway can be connected to either an AERCO BMS, Model 168 or BMS II, Model 5R5-384 to
provide monitoring or control by a third party BAS. The Modbus connection to monitor or control either a
BMS or BMS II is via the unit’s RS232 port.
Although the BMS and BMS II are extremely similar in many respects, separate procedures are provided
in subsections 3.2 (BMS) and 3.3 (BMS II) for the two models to avoid any possible confusion. Refer to
the appropriate procedures related to your installation.
3.2 INTERFACING THE XPC GATEWAY TO BMS, MODEL 158
The BMS (Model 158) contains both an external RS232 port (DB9) and an internal RS232 port. The
external RS232 port is located on the left side of the BMS and the internal RS232 port is located on the
terminal board behind the connection cover of the BMS. These connections are shown in Figures 3-1 and
3-2. The BMS external RS232 and internal RS232/RS485 connector pinouts are shown in Figure 3-3.
Although either RS232 port can be used, AERCO recommends using the internal RS232 port.
1
9
RS232 PORT
(DB9 - FEMALE)
INTERNAL RS485 & RS232
CONNECTORS LOCATED
BEHIND COVER
(SEE FIGURE 3-2, VIEW A – A)
PANEL
COVER
A
A
Figure 3-1. BMS Left Side View