Wired SmartNode is a new introduction within the 75F systems. This aspect lets the users wire a SmartNode to a CCU to aggregate data from the SmartNode to the cloud and consume the control sequences from the CCU for its operation.
This helps users wire more SmartNodes in the 75F BMS system, in geographies with limited RF bands.
It also enables the SmartNode usage in an External BMS (BACnet/Modbus), that does not support wireless communication.
Singapore is a geography where only the 9th and 10th RF channels are made available for the BMS activities. This limits the users to only bands with 9000- 9999 & 10000 to 10999 available for wireless connection and communication.
The wired SmartNode is an excellent choice for geographies with such restrictions.
Wiring a SmartNode is as easy as it is to connect the SmartNode wirelessly.
You can use an RS485 Daisy Chain Adapter to wire Multiple SmartNodes in a network.
Note: The RS485 is only used for communication, and the SmartNodes are powered by the 24V power supply, which can also be daisy-chained for better and easier wiring.
One end of the above-mentioned Daisy Chain Adapter goes into the RS485 port of the SmartNode
The other end of the Daisy Chain Adapter uses a wire as shown below to continue the daisy chain for communication.
The wires in the communication cable (RS485 system/ twisted pair shielded cable) are connected to terminals A & B of the 6 terminal end.
When the above wire and adapter are used, the following illustrated connection is achieved
The actual wired setup is achieved as below, from a test setup.
The below image shows the daisy-chained SmartNode with 24V power wires and RS485 communication wiring.
Note: Based on the connection requirements in an actual field scenario the twisted pairs of wires cable length would vary.
| Termination at CM Board/CCU/ External BMS (BACnet/Modbus).
The wires are terminated at the CM Board using the same RS485 Daisy Chain adapter as below.
And terminated at the External BMS, as below.
| Setting SmartNode for Wired Communication and Control
When a SmartNode is used in a wired environment the configuration will have to be set in the device to support the communication.
For more information on modifying the setting in the SmartNode device for wired communication support refer to Setting SmartNode for Wired Communication & Control