AERCO XPC GATEWAY Communications - Manual (Page 51)

GF-122 AERCO XPC GATEWAY
51
3.2.1.3 Configuring the BMS
Once the BMS has been wired to the Gateway as described in subsection 3.2.1.1 or 3.2.1.2, turn on
power to the BMS and perform the following configuration settings:
NOTE
Refer to AERCO Instruction Manual GF-108M for additional information on
BMS keypad functions and displays.
1. Press the
FIELD ADJ key on the BMS front panel to enter the Field Adjust mode.
2. Press the
AIR TEMP key once. RS232 MODE will appear in the top line of the display. If necessary,
press the
▲ or ▼ arrow key until MODBUS SLAVE appears in the second line of the display.
3. Press the
AIR TEMP key again. RS232 BAUDRATE will appear in the top line of the display. Press
the ▲ or ▼ arrow key until 9600 appears in second line of the display..
4. Press the
AIR TEMP key again. MODBUS ADDRESS will appear in the top line of the display. Press
the ▲ or ▼ arrow key until an address of 128 appears in the second line of the display. Contact
AERCO if another BMS address is required.
5. This completes setup of the BMS.
Refer to subsection 2.3 to connect the required C-More Controllers in a “daisy chain” configuration. Also,
refer to the sample network wiring diagram in Figure 2-9.
NOTE
When the C-More is connected to the AERCO BMS/BMS II, bias and
termination switches must be activated.
Do not proceed to the next step until all required AERCO equipment is connected.
• Turn On the BMS and all of the C-More Controllers.
• Apply 24 VAC power to the XPC Gateway.
Following preliminary power-up checks, the XPC Gateway will begin to read BMS data and allow it to be
controlled by the BAS Master.
3.2.2 C-More Boilers Being Network-Controlled by a BMS
When the BMS is controlling C-More Boilers on the RS485 Modbus network it is the single “Master”
device. No other device, such as the Gateway or a BAS can assume control of the network. However, the
BMS also functions as a communications Gateway which permits a BAS to monitor the BMS as well as
the boilers on the Modbus network. This is accomplished utilizing the RS232 port of the BMS.
The Modbus Pass Thru feature allows AERCO boiler system owners to link their Energy Management
Systems (EMS) and/or Building Automation Systems (BAS) to communicate directly with AERCO C-More
boiler control units as far as reading operational parameters are concerned. In this case, the Boiler
Management System (BMS) simply “passes through” operating parameter information directly from the
C-More boiler control unit to the customer’s EMS/BAS. This is accomplished by enabling the Modbus
Pass Thru feature on the BMS/BMS II units.