Using the Modbus RTU Protocol

ION 7500 / ION 7600 User’s Guide	Using the Modbus RTU Protocol

Both the ION 7500 and ION 7600 meters can make any real-time data available through the Modicon Modbus RTU protocol. Modbus Master devices connected to the meter can access this data. Modbus Master devices can also write data into ION registers, making device configuration changes or initiating control actions.

The Factory Modbus Configuration

The meter makes data available to Modbus Master devices using four Modbus Slave modules. These modules are linked to other modules in the meter that provide the energy, power and demand data. Once a communications channel is configured to use Modbus RTU protocol, the data is available to Modbus Master devices.

NOTE

Connect to IP Service Port 7701 for Modbus RTU communications over Ethernet. The Modbus Unit ID of the meter over Ethernet is 100.

Set the COM port to the Modbus RTU protocol

			Communications Port
Power Meter	Vln a	Modbus Slave	40011
Module		Module
			Data is available
			to Modbus master
			devices

ION meter Measured data is linked to the Modbus module’s input.

Modbus Slave module outputs data in Modbus format

As the data available through the Modbus Slave modules is in a specific format, knowledge of the Modbus protocol and an understanding of the settings used in the meter are required to interpret the data provided.

Changing the Modbus Configuration

If the factory Modbus configuration does not suit your needs, the existing Modbus Slave modules can be relinked to other parameters that you want to access through Modbus.

If your Modbus Master device requires data in a format different than that provided by the factory Modbus configuration, you can edit the setup registers in the Modbus Slave modules. These setup registers specify the Modbus format, scaling and base address settings.

Refer to the online ION Programmer’s Reference for complete details on Modbus Slave module.

Chapter 3 - Default Meter Functionality

Page 69

7500, 7600 specifications

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Multi-Tech Systems 7500, 7600 manual Using the Modbus RTU Protocol, Factory Modbus Configuration

Models: 7500 7600