Chapter 4: E2 Controller

The number shown for Unit 2 is three, the result of adding 1 + 2. This confirms that Unit 2's supply temperature and return humidity sensors are detected by the lead controller. If a one appeared instead for Unit 2, it would indicate the signal for the return humidity sensor is not present. That sensor is either not enabled or it has failed.

4.7 BMS Communications

When BMS communication are used, the controller must be equipped with an optional expansion card designed for one of a variety of serial communications protocols available (see Section 4.1.4). A communications port on the expansion card allows the controller to be field connected to a central Building Management System (BMS) for monitoring and control of data points.

An RS-485 serial port is available for Modbus or BACnet MS/TP protocols and a 10BASE-T port is available for TCP/IP based protocols such as BACnet over IP, BACnet over Ethernet, SNMP, or HTTP.

Table 4-25. BMS communications parameters.

Supported Protocols

Media

Connection

 

 

 

BACnet over IP

10BASE-T

RJ-45 direct

 

 

 

BACnet over Ethernet

10BASE-T

RJ-45 direct

 

 

 

HTTP

10BASE-T

RJ-45 direct

 

 

 

SNMP V1, V2c

10BASE-T

RJ-45 direct

 

 

 

Modbus over IP

10BASE-T

RJ-45 direct

 

 

 

BACnet MS/TP

Twisted pair

Daisychain

 

 

 

Modbus RTU

Twisted pair

Daisychain

 

 

 

Direct Connection

Daisychain Connection

Figure 4-91. Direct connection vs. daisychain connection.

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).

724-746-5500 blackbox.com

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Black Box CRDX-W-FS-24KW, CRDX-W-FS-12KW, CRDX-A-FS-24KW, CRDX-G-FS-24KW user manual BMS Communications, Direct Connection

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