IEC 60870-5-104 Communication Driver

IEC 60870-5-104 Communication Driver is intended for data connection between Reliance's runtime software and devices communicating via the communication protocol according to the IEC 60870-5-104 standard.

Starting up the driver

The communication driver is a DLL loaded into memory by the Reliance 4 Driver Server program, which can be launched either as a Windows service at Windows startup or as a standard application at the start of a visualization project. Information required to make a connection with devices is read from the visualization project. After reading this information, communication to all connected devices is activated.

Establishing a connection with the device

The first communication packet sent to the device is the packet for establishing a connection. This is the so-called "Test Frame" when communicating through the TCP protocol. However, the special "Connect" communication packet is used for this purpose when communicating through the UDP protocol. This packet is transmitted even if the connection is cut off. A successful connection is followed by further communication packets. If the connection is not made, the communication driver sends a request to connect repeatedly at a specified interval.

Reading data

Data transmission is activated after making a connection by sending the "Start Data" communication packet. Updating the data is based on spontaneous report reception. The data can also be read by sending the so-called General Query.

For download: IEC 60870-5-104 Communication Driver Interoperability Guide

Supported communication functions

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