HyperStat Split as Modbus Server

| Overview

HyperStat Split is the best-in-class thermostat that can measure parameters in the zone and controls equipment at zone and system levels (RTUs & FCUs) by connecting seamlessly over two wires reducing the cost of additional cabling. For more information on the device refer to HyperStat Split Overview & Installation

With the vision towards platform play and greater interoperability in the building management space, the HyperStat Split is built and developed in such a way that it can either, work in a Airoverse BMS environment connected to Airoverse's CCU configured for system and terminal level profiles, or can support an external Modbus network as a Modbus server, or it can also work as an independent or standalone device which can work as per profiles which can be configured in the HyperStat Split itself.

The HyperStat Split as Modbus Server feature provides the capability to the customer, to configure a HyperStat Split with any Modbus device and read the data from the Modbus device in a certain format. With its powerful onboard sensors, HyperStat Split can be an excellent asset to the Modbus network-supported BMS.

| Wiring

The wiring that is used to connect a Modbus device to a HyperStat Split is called the RS485 communication protocol. The RS485 connector uses a three-wire protocol as shown below:

It comprises an earthing sheath and a twisted pair of wires. Every Modbus device has an 'A' and 'B' indication in them, for aiding the wiring.

The earthing or the ground wire is usually earthed only at one point. Normally, this connection is made at one end of the main cable, in this case, it is connected to the ground point of the COnnect Module.

For the Twisted pair of wires, there are no specific color criteria that are followed, it can be of any color. The wire that is connected to the 'A' indication point in the Modbus device is connected to the 'A' indication point in the Connect Module, and the wire that is connected to the 'B' indication point in the Modbus device is connected to the 'B' indication point in the COnnect Module.

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

| Wiring Harness

The Airoverse supports a type of wiring harness to meet the need for Daisy Chain HyperStat Split in a Modbus network.

3 Wire to 6 Wire Screw Connector 

This uses a 4-pin Molex connector at one end and a 6-wire, screw connector at the other end. You can simply twist the four wires and insert them into the screw slots provided for connection. 

| Example Daisy Chaining

| Configuration

From the Home screen of the UI 

• Press the + & - buttons together to navigate to the other screens of the HyperStat Split 

The Inputs screen is displayed initially

• Press the next button to navigate to the Communication options screen

The communications options screen is displayed.

• Press the down arrow  to navigate to the options available under the screen.

• Press the select option to modify the protocol

• Press the up  arrow to select the Modbus option.

• Press Deselect and press confirm to confirm the comm option selection.

The HyperStat Split is configured as a Modbus Server, and it restarts.

| Configuration Parameters

Further, navigate again to the communications screen from the HyperStat Split Home screen UI

• Press the  to navigate to the options available.

• Press the select option to modify the configuration parameter Modbus address.

• Use the up or down  or use the touch slider to modify the Modbus address.

• Press Deselect to confirm the selection.
• Press the  to navigate to the options available
• Press the select option to modify the configuration parameter Baud rate.
• Use the up or down  buttons to modify the Baud rate.

• Press Deselect to confirm the selection.

• Press the  to navigate to the options available
• Press the select option to modify the configuration parameter Parity.
• Use the up or down  to modify the parity.

• Press Deselect to confirm the selection.

• Press the  to navigate to the options available
• Press the select option to modify the configuration parameter Stop bits.
• Use the up or down  to modify the stop bits.

• Press Deselect to confirm the selection.

The HyperStat Split is configured as a Modbus Server, the corresponding configuration parameters are configured, and the device is ready to read and serve the data.

Note: Attached to this article is a file with the information related to Modbus Mapping for HyperStat Split

| Feature Availability Versions

• The support for Modbus protocol in the HyperStat Split is available from the HyperStat Split + Connect Module versions 100.7 + 1.0 and above.