Direct Bms Control; Bms Communication - Black Box CRCW-12 User Manual

If multiple A/C units are grouped together, each controller added to the group must be configured with a CPU address for BMS
communication.
For complete details on using BMS control, contact Black Box Technical Support (see Chapter 6).

4.7.1 Direct BMS Control

The controller may be configured to accept proportional analog signals that mimic a sensor. The controller will act on that signal
whether it comes from a real sensor or a BMS analog output. Refer to Section 4.9 for the E2 controller's BMS parameters.

4.7.2 BMS Communication

The Service>BMS Comm menu is used to set up the parameters to allow a BMS (BAS) interface for monitoring controller
operation for the serial-based networks such as BACnet MS/TP. Units using the BACnet over IP, BACnet over Ethernet, or HTTP
protocols do not need to change anything in this menu loop.
The BMS address and baud rate have meaning only on RS-485 networks and with the serial protocols of Modem, Modbus RTU,
Commission, and Carel. The baud rate is fixed for BACnet. Systems using a 10BASE-T interface should use the defaults of address
1, baud rate 19200, and protocol BACnet.
Certain Integer and Digital variables that start with BMS (see Sections 4.9.7–4.9.9) require that the BMS "keep alive" parameter
changes between 1 and 2 within a 10-minute span. The general procedure is to set up variables like the BMS low fan speed and
then write a 1 to the BMS "keep alive" address.
Figure 4-98. BMS Comm screen #1.
Figure 4-99. BMS Comm screen #2.
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Chapter 4: E2 Controller
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