Black Box CRDX-A-FS-12KW Manuale Utente
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Page 101
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.
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.
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.
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.
communication.
For complete details on using BMS control, contact Black Box Technical Support (see Chapter 6).