Hyperstat as Modbus Client

4 Minute Read

| Overview

The HyperStat is part of 75F's vertically integrated suite of intelligent building solutions, delivering multi-mode sensing, remote monitoring , and individual zone control for the comfort and productivity of building occupants, for more information refer to HyperStat Installation & Hyperstat UI.

With the vision towards platform play and greater interoperability in the building management space, the HyperStat is built and developed in such a way that it can either, work in a 75F BMS environment connected to 75F's CCU configured for system and terminal level profiles, or can support an external Modbus network as a Modbus client, or it can also work as an independent or standalone device which can work as per profiles which can be configured in the Hyperstat itself.

The Hyperstat as Modbus Client feature provides the capability to the customer, to configure a Hyperstat with any Modbus device and read the data from the Modbus device in a certain format. with its powerful onboard sensors HyperStat 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 is called the RS485 system. The RS485 connector uses a three-wire protocol as shown below:

It comprises an earthing wire 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 Hyperstat.

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 Hyperstat, and the wire that is connected to the 'B' indication point in the Modbus device is connected to the 'B' indication point in the Hyperstat.

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

| Wiring Harness

The 75F supports a type of wiring harness to meet the need for Daisy Chain Hyperstat in a Modbus network.

4 Pin 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

Connection to HyperStat

 

| Configuration

From the Home screen of the UI 

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

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 is configured as a Modbus client, and it restarts.

| Configuration Parameters

Further, navigate again to the communications screen from the Hyperstat 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 is configured as a Modbus Client, and 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.