ION 7500 / ION 7600 User’s Guide

Using the Modbus/TCP Protocol

 

 

You can use the Modbus RTU protocol to write values into ION external numeric, pulse and Boolean registers, allowing you to enable, disable and reset meter functions. You can also use the Modbus protocol to change setup register values in various ION modules to configure the meter’s operation.To bring data into the meter with Modbus RTU, you must disable the meter’s password security. Information about writing ION registers through Modbus is available in the ION 7500 / ION 7600 Series meter Modicon Modbus Serial Communications Protocol document.

Using the Modbus/TCP Protocol

Modbus/TCP is the newest open Modbus protocol variant (formerly called MBAP). It defines the packet structure and connection port (port 502) for the industry standard TCP/IP protocol. The structure of Modbus/TCP is very similar to the Modbus RTU packet except that it has an extra six-byte header and does not use the cyclic redundancy check (CRC). Some of the newest ION firmware now supports Modbus/TCP for direct communications with the meter.

Modbus/TCP retains the Modbus RTU limit of 256 bytes to a packet. It is suggested that higher through-put is possible if this limitation is removed. This variant is called Enhanced Modbus/TCP but, so far, few devices have moved to support it.

Modbus TCP Communications

You can now communicate to the meter via Modbus TCP (formerly called MBAP).

Your meter must have the optional Ethernet port. Connect to socket 502.

Connect to socket 502

Be aware that you cannot form an EtherGate to the Modbus TCP network.

Chapter 3 - Default Meter Functionality

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Multi-Tech Systems 7500, 7600 manual Using the Modbus/TCP Protocol, Modbus TCP Communications
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7500, 7600 specifications

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