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• The originator ASDU address is not present.
• ASDU address is 1 byte, it is defined as the station address. ASDU addresses of all stations on one line must be different.
• The cause of transmission is 1 byte (does not contain the Originator ASDU address).
• The information object address is 2 bytes, it is defined as an I/O tag address.

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• Communication protocol "IEC 870-5-101 balanced", "IEC 870-5-101 unbalanced primary (Master)" or "IEC 870-5-101 unbalanced secondary (Slave)".
• The station address is a decimal number in the range 0 - 255 and is used in the protocol as the ASDU address. It can be specified as a decimal number or as a hexadecimal number with a hash at the beginning (e.g. #0A).
• The synchronization of the station real-time may be enabled also for the protocols "master" and "balanced - station A (controlling)". Set the synchronization period to a nonzero value. The synchronization is executed by ASDU 103 "Clock synchronization command" in the local time according to settings of the D2000 System.

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I/O tag address is a numerical address of data object IOA (in range 0 - 65535).
The I/O tag with an address starting with %IGNORE will be ignored.

In the case of command direction in master or balanced mode is necessary to configure a proper ASDU type:

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** - ASDU 17 and 38: the value of SEP byte sets the attributes FLA (0.bit), FLB (1.bit) up-to FLH (7.bit), following 2 bytes (CP16Time2a) are interpreted as a positive number (0-60 000) into the value of I/O tag with value type Ci/Ai or as a relative time (0-60 seconds) into the value of I/O tag with TiR value type TiR.

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*** - ASDU 18, 39 and 40: value of SPE(ASDU 18,39) or OCI (ASDU 40) byte sets the attributes FLI (0.bit), FLJ (1.bit) up-to FLP (7.bit). The value of byte QDP sets the attributes FLA (0.bit), FLB (1.bit) up-to FLH (7.bit), following 2 bytes (CP16Time2a) are interpreted as a positive number (0-60 000) into the value of I/O tag with value type Ci/Ai or as a relative time (0-60 seconds) into the value of I/O tag with TiR value type TiR.

Note 2: When using the system and line redundant categories of lines, the status of line and station is formed by a logical sum of all used lines. It means, that if the redundant system consists of four lines and just one line is working, the status of the station and line is all right. The status of lines is presented with the help of special input or output I/O tag (of integer and real type, i.e. Ai/Ao/Ci/Co). The name of this I/O tag has this format: [line_name]_SystemStatus (e.g. for line L.Test it is M.Test_SystemStatus). The value of the I/O tag represents the binary format of the status of N-tuple lines. If the first three lines are okay but the last one does not work (SystemB/SecondaryLine) i.e. [FALSE, TRUE, TRUE, TRUE], I/O tag has the value 0b0111, i.e. 7.
The order of lines mapped to individual bits is [SystemB/SecondaryLine,  SystemB/PrimaryLine, SystemA/SecondaryLine, SystemA/PrimaryLine].

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Info
title Blogs
You can read blogs about  about the IEC 870-5-101 protocol (for now, in Slovak language only):  Communication – protocol IEC 101 Communication – protocol IEC 101, part 2 Communication – protocol IEC 101, part 3

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