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IEC 62056-21 Communication Driver

IEC 62056-21 Communication Driver is intended for data connection between Reliance's runtime software and telemetry systems communicating via the communication protocol according to the IEC62056-21 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.



Reading data

Data is read periodically or based on a one-shot request of Reliance's runtime software. When reading periodically, the tag value is updated at a configured interval.


The communication driver allows for both reading the device's data via the so-called Data readout mode and reading tag values one by one in the so-called Programming mode. The way the data is read depends on the selection in a visualization project.


In addition to mode A with a constant rate of 300 Bd, the driver supports modes B and C with their initial rate changed to the rate supported by the telemetry system. Tag values can be provided in both text and digital formats.


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