ProSoft Technology 5201-DFNT-104C - Manual (Page 118)

Reference 104C Version 3 ♦ ProLinx Gateway
Protocol Manual IEC 60870-5-104 Client (Firmware v3.xx)
Page 118 of 139 ProSoft Technology, Inc.
August 4, 2011
6.4.2 Application Layer
Transmission mode for application data
Mode 1 (Least significant octet first), as defined in clause 4.10 of IEC 60870-5-4,
is used exclusively in this companion standard.
Common Address of ASDU
(System-specific parameter)
 One octet ⌧ Two octets
Information object address
(System-specific parameter)
 One octet
 Structured
 Two octets  Unstructured
⌧ Three octets
Cause of transmission
(System-specific parameter)
 One octet ⌧ Two octets (with originator address)
Length of APDU
(System-specific parameter, specify the maximum length of the APDU per
system)
The Maximum length of the APDU is 253 (default). The maximum length may be
reduced by the system.
253 Maximum length of APDU per system