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UR FAMILY – COMMUNICATIONS GUIDE
INTEROPERABILITY DOCUMENT
CHAPTER 6: IEC 60870-5-104 COMMUNICATION
6
3. PHYSICAL LAYER
Transmission speed (control direction
)
Transmission speed (monitor direction)
4.
LINK LAYER
When using an unbalanced link layer, the following Application Service Data Unit (ASDU) types are returned in class 2
messages (low priority) with the indicated causes of transmission:
The standard assignment of ASDUs to class 2 messages is used as follows:
A special assignment of ASDUs to class 2 messages is used as follows:
5. 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
One Octet
Two Octets
Information object address
One Octet
Structured
Two Octets
Unstructured
Three Octets
Unbalanced interchange
circuit V.24/V.28 standard
Unbalanced interchange
circuit V.24/V.28 recommended
if >1200 bits/s
Balanced interchange circuit
X.24/X.27
100 bits/sec.
200 bits/sec.
300 bits/sec.
600 bits/sec.
1200 bits/sec.
2400 bits/sec.
4800 bits/sec.
9600 bits/sec.
2400 bits/sec.
4800 bits/sec.
9600 bits/sec.
19200 bits/sec.
38400 bits/sec.
56000 bits/sec.
64000 bits/sec.
Unbalanced interchange
circuit V.24/V.28 standard
Unbalanced interchange
circuit V.24/V.28 recommended
if >1200 bits/s
Balanced interchange circuit
X.24/X.27
100 bits/sec.
200 bits/sec.
300 bits/sec.
600 bits/sec.
1200 bits/sec.
2400 bits/sec.
4800 bits/sec.
9600 bits/sec.
2400 bits/sec.
4800 bits/sec.
9600 bits/sec.
19200 bits/sec.
38400 bits/sec.
56000 bits/sec.
64000 bits/sec.
Link transmission procedure
Address field of the link
Balanced Transmission
Unbalanced Transmission
Not Present (Balanced Transmission Only)
One Octet
Two Octets
Structured
Unstructured
Frame Length (maximum length, number of octets): Not selectable in companion IEC 60870-5-104 standard
