AERCO XPC GATEWAY Communications - Manual (Page 65)

GF-122 AERCO XPC GATEWAY
65
7 6 5 4 3 2 1
Y2
Y2 Y3 Y4
Y1
SW1 A1
I
0
M
O
D
B
US
A
(
-)
M
O
DB
US
B
(
+
)
BCM FRONT VIEW
Figure 4-2. BCM Modbus (RS485) Connections
4.2 BCM WIRING CONNECTIONS TO AERCO XPC GATEWAY
XPC Port 2 is normally used to connect to AERCO equipment, except when the controlling BAS is
utilizing a LonWorks SLTA module, or communicating via BACnet PTP. In this case, Port 1a of the XPC
must be used to connect AERCO equipment. Therefore, follow the appropriate wiring instructions in
subsection 4.2.1 (Port 2) or 4.2.2 (Port 1a) as applicable.
4.2.1 BCM Wiring Connections to XPC Port 2
When the controlling BAS is utilizing BACnet MS/TP, Johnson N2 or LonWorks protocol without an
SLTA, use XPC Port 2 as follows:
1. On the XPC Gateway, position the EIA-232/EIA-485 and 2W/4W jumpers to EIA-485 and 2W
respectively as shown in Figure 4-3.
EIA-485
EIA-232 2W
4W