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 >1
200 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
10.1.4
Link layer
(Network-specific parameter, all options that are used are to be marked with “X“).
Specify the maximum frame length. If a non-standard assignment of class 2
messages are 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
Address field of the link
Balanced transmission
not present (balanced
transmission only)
Unbalanced transmission
One octet
Table continues on next page
1MRS757105 B
Section 10
Appendix 2 IEC 60870-5-104 interoperability
RER601/603
79
Technical Manual