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Application layer
Transmission mode for application data
Mode 1 (the 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)
Two octets
One octet
Information object address (system-specific parameter)
structured
One octet
unstructured
Two octets
Three octets
Cause of transmission (system-specific parameter)
Two octets (with originator address)
One octet
Length of APDU (system-specific parameter)
The maximum length of the APDU is 253 (default). The maximum length can be reduced
per system.
Maximum length of APDU
per system
Selection of standard ASDUs
Process information in monitor direction (station-specific parameter)
M_SP_NA_1
:=Single-point information
<1>
M_SP_TA_1
:=Single-point information with time tag
<2>
M_DP_NA_1
:=Double-point information
<3>
M_DP_TA_1
:=Double-point information with time tag
<4>
M_ST_NA_1
:=Step position information
<5>
134
1MRS758690
COM600 series 5.0
Master Protocols (Ethernet) and Applications Technical Refer-
ence Manual
Содержание COM600 series 5.0
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