1MAC302441-MB A Section 3
IEC 60870-5-101/104 protocol implementation
RER620 41
Point List Manual
Transmission speed (monitor direction)
8.4 Link Layer
(network-specific parameter, all options that are used are to be marked “X”. Specify the
maximum frame length. If a non-standard assignment of class 2 messages is implemented
for unbalanced transmission, indicate the Type ID and COT of all messages assigned to
class 2.)
Frame format FT 1.2, single character 1 and the fixed time out interval are used exclusively
in this companion standard.
When using an unbalanced link layer, the following ASDU types are returned in class 2
messages (low priority) with the indicated causes of transmission:
Unbalanced interchange
Circuit V.24/V.28
Standard
Unbalanced interchange
Circuit V.24/V.28
Recommended if >1200 bit/s
Balanced interchange
Circuit X.24/X.27
100 bit/s
X
2400 bit/s
X
2400 bit/s 56000 bit/s
200 bit/s
X
4800 bit/s
X
4800 bit/s 64000 bit/s
X
300 bit/s
X
9600 bit/s
X
9600 bit/s
X
600 bit/s
X
19200 bit/s
X
1200 bit/s
X
38400 bit/s
Link transmission procedure Address field of link
X
Balanced transmission Not present (balanced transmission only)
X
Unbalanced transmission
X
One octet
X
Two octets
X
Structured
X
Unstructured
Frame length
4095
Maximum length L (control direction)
255
Maximum length L (monitor direction)
Time during which repetitions are permitted (Trp) or number of repetitions
The standard assignment of ASDUs to class 2 messages is used as follows:
Type Identification Cause of Transmission
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