Transmission speed (control direction)
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 2400 bit/s 2400 bit/s 56000 bit/s
200 bit/s 4800 bit/s 4800 bit/s 64000 bit/s
300 bit/s 9600 bit/s 9600 bit/s
600 bit/s 19200 bit/s
1200 bit/s 38400 bit/s
Transmission speed (monitor direction)
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 2400 bit/s 2400 bit/s 56000 bit/s
200 bit/s 4800 bit/s 4800 bit/s 64000 bit/s
300 bit/s 9600 bit/s 9600 bit/s
600 bit/s 19200 bit/s
1200 bit/s 38400 bit/s
3.6 Link layer
(Network-specific parameter, mark all used options with an “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.
Link transmission procedure
Address field of the link
Balanced transmission Not present (balanced
transmission only)
Unbalanced transmission One octet
Table continues on next page
1MRS757824 C Section 3
IEC 60870-5-101/104 protocol implementation
Recloser Protection and Control RER615 53
Point List Manual
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