UR FAMILY – COMMUNICATIONS GUIDE 5-1
UR Family
Chapter 5: IEC 60870-5-103 communication
IEC 60870-5-103 communication
This chapter outlines the IEC 60870-5-103 communications protocol.
5.1 Overview
IEC 60870-5-103 is defined as a companion standard for the informative element of the protection equipment. IEC 60870-
5-103 defines communication for a serial, unbalanced link only. Communication speeds are defined as either 9600 or
19200 baud.
This manual assumes basic knowledge of the IEC 60870-5-103 protocol and the standard IEC 60870 documents relating to
the protocol.
Standard IEC 60870 documents relating to IEC 60870-5-103:
• IEC 60870-5-1 Transmission frame formats
• IEC 60870-5-2 Link transmission procedures
• IEC 60870-5-3 General structure of application data
• IEC 60870-5-4 Definition and coding of application information elements
• IEC 60870-5-5 Basic application functions
• IEC 60870-5-6 Conformance testing guidelines
An IEC 60870-5-103 device is required to provide an interoperability table. Interoperability means that any required
application data in the device, which can be coded into an IEC 60870-5-103 data type, can be mapped into the IEC 60870-
5-103 address space. This data is recognized by any IEC 60870-5-103 master.
5.2 Factor and offset calculation to transmit measurand
The general formula for the transmitted value is Xt = a * X + b
where
The protocol applies when ordered with the product. Check your order code.
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