Configuring Modbus RTU over TCP

With your gateway device running the Zoho IoT's Edge Agent, you can remotely push configurations to connected gateway devices to communicate with its device/sensor supporting Modbus RTU over TCP protocol directly from the Zoho IoT application.

This guide will walk you through configuring a sensor that supports Modbus RTU over TCP in the Zoho IoT application, allowing the Edge Agent to seamlessly communicate with it.

Prerequisite

The gateway device must be running the Zoho IoT agent.
The device registered in the Zoho IoT application must have Edge Agent as the Device Application.
The gateway must be connected to the Zoho IoT application.
The sensors and peripheral connected to the gateway must communicate using Modbus Protocol over TCP

To configure Modbus RTU over TCP protocol,

Access the End Application and navigate to the Device Information page of the required Gateway device.

Select Actions > Edge Agent Configuration.
Click Configure.
If a configuration is already setup, click Actions > Update Edge Agent Configuration Settings.
Set the polling timer and Gateway metrics as required, then click Next. For this illustration, a polling timer setting of 30 seconds is given.

Polling timer: The interval at which the gateway requests data from connected device or sensor.
Click Map Peripheral if this is your first configuration or click Add Peripheral if you already have other configurations.
Select Ethernet as the connectivity and choose Modbus RTU Over TCP as the protocol, then click Next.
Select the Device Product of the connected peripheral. For this illustration the CONZERV EM6400 is selected.

Note: Only imported device products that support Modbus RTU/Modbus TCP and have at least one valid Modbus mapping configured will be available for selection.

Provide the following details for the peripheral device.

Name   : A user-friendly identifier for the peripheral device.
Slave ID   : The unique ID assigned to the Modbus slave device for   communication.
IP Address   : The network address of the peripheral device.
Port : The communication port used for Modbus TCP.
Edge Key : A key for identifying the peripheral device in the payload, essential for recognising the device's data in the payload and is used in datapoint parsing.
Click Add.

Now that you have provided the necessary details about the peripheral device, you can remotely deploy the configuration of the device product from the Zoho IoT Application.

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