Before You Begin

Introduction

Use the Modbus Explicit Message window in the Control Expert DTM to send an explicit message to a Modbus TCP module or distributed device on the network. You can use explicit messaging to perform many different services. Not every Modbus TCP device supports every service.

Connect the DTM

Before you can configure explicit messaging for or devices, make the connection between the for the target communication module and the physical module:

Step	Action
1	In the DTM Browser, find the name that is assigned to your Ethernet communications module.
2	Right-click on the module name.
3	Scroll to Connect.

EtherNet/IP™

A network communication protocol for industrial automation applications that combines the standard internet transmission protocols of TCP/IP and UDP with the application layer common industrial protocol (CIP) to support both high speed data exchange and industrial control. EtherNet/IP employs electronic data sheets (EDS) to classify each network device and its functionality.

DTM

(device type manager) A DTM is a device driver running on the host PC. It provides a unified structure for accessing device parameters, configuring and operating the devices, and troubleshooting devices. DTMs can range from a simple graphical user interface (GUI) for setting device parameters to a highly sophisticated application capable of performing complex real-time calculations for diagnosis and maintenance purposes. In the context of a DTM, a device can be a communications module or a remote device on the network.

See FDT.