PACiS GTW GTW/EN T/C40, Техническое руководство

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GTW/EN CT/C40 Communication
Page 8/64 PACiS Gateway
Command transmission
All control/set point commands shall be Select before Execute, or Direct Execute.
For only the set point commands: Activation termination (C_SE_ACTTERM) shall be
returned to the controlling station to signal the end of a control sequence. This is
configurable in Registry.
For only the control commands: Activation termination is returned to the controlling station to
signal the end of a control sequence. This isn’t configurable in Registry.
The QU field of the Qualifier of Command shall be set to zero (0), no additional definition.
Short Pulse Long duration, Long Pulse long duration are managed at bay-computer level.
Test procedure
A test command may be issued by the controlling station to ensure the availability of the
communications link and the commands subsystem.
Test commands are received at the controlled station on the active link. The controlled
station mirrors the test command, on the link from which it was received, with a cause of
transmission indicating activation confirmation.
An error response should be sent if the command is incorrect, with a cause of transmission
indicating negative activation confirmation.
2.7 Application layer
Transmission mode for application data
Mode 1 (Least significant octet first), as defined in clause 4.10 of IEC 870-5-4, is used
exclusively in this companion standard.
Common address of ASDU
(System-specific parameter)
The address field of the link and the common address of ASDU could have a different
number of bytes
S One octet S Two octets
Information object address
(System-specific parameter)
S One octet S Structured
S
Two octets
S
Unstructured
S Three octets
Cause of transmission
(System-specific parameter)
S
One octet
S
Two octets (with originator address)