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| Overview

The SmartNode can now be wired to an external Modbus client/ BMS/ or the CCU for communication and control, and act as a server to the client in a Modbus-based BMS or an external BMS.

Customers can now leverage the power of SmartNode combined with a local interface sensor, which could be a wall sensor or a multi-sensor to sense different parameters and actuating equipment at the terminal level.

The above capability is provisioned with the introduction of communication options in the SmartNode , and when that configuration is changed in the SmartNode via the communication options, the SmartNode will be able to start communication with the external Modbus client/ BMS/ or the CCU respond to its user intents and sequences.

| Wiring

The wiring that is used to connect a Modbus client/ BMS/ or the CCU to a SmartNode is called the RS485 system & the RS485 Daisy chain Adapter.

The RS485 connector uses a three-wire protocol as shown below:

The RS485 Daisy chain Adapter looks like this, as shown below:

Using the above wire combination the wiring of SmartNode to external Modbus client/ BMS/ or the CCU is achieved.

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For more information on how to wire SmartNode in such wired environments, refer Wired SmartNode.

For other factors to be considered while wiring an RS485 cable into a Modbus client kindly refer to ModBus/BACnet Wiring and General Guidelines

| Configuration

To configure a SmartNode to be used with an External Modbus client/ BMS, or the CCU

From the Home screen of the UI 

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  • Press the right arrow buttons to navigate to the installer options screen of the SmartNode .

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  • Press the down arrow button to explore the options.

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  • Press the down arrow button further to navigate to the communication options.

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  • Press the right arrow button to access the communication options.

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The default option is the RF to CM which is for a SmartNode used with the ClimaVision CCU.

  • Press the down arrow button to set the SmartNode , to be used with an External Modbus/ BMS

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  • Press the down arrow button to set the SmartNode , to be used with a CCU in a wired environment.

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  • Press the right arrow button to confirm the communication option change.

| Configuration Settings

Once the SmartNode communication option is set, to be used with an External Modbus / BMS,

  • Press the left arrow button to go back to the installer option screen.

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  • Press the down arrow button to navigate to the RS485Modbus Setting option.

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  • Press the right arrow button to access the option.

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  • Press the right arrow button and use the up and down arrow buttons to set the Modbus server. address.

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  • Press the right arrow button to confirm the change in the Modbus address.
  • Press the down arrow to navigate to the RS485 Baud Rate option.

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  • Press the right arrow button and use the up and down arrow buttons to set the Baud rate.

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  • Press the right arrow button to confirm the change in the Baud Rate.
  • Press the down arrow to navigate to the RS485 Parity option.

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  • Press the right arrow button and use the up and down arrow buttons to set the RS485 parity.

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  • Press the right arrow button to confirm the change in the Parity.
  • Press the down arrow to navigate to the Stop Bit option.

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  • Press the right arrow button and use the up and down arrow buttons to set the RS485 parity.

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  • Press the right arrow button to confirm the change in the Parity.

Once the communication option is changed and the configuration options are set, the SmartNode is now ready to be used with Modbus Client in a Modbus network based BMS.

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