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Transmission speed (monitor direction)
Balanced interchange circuit
X.24/X.27
Unbalanced interchange cir-
cuit V.24/V.28 Recommended
if > 1200 bit/s
Unbalanced interchange cir-
cuit V.24/V.28 Standard
2400 bit/s
2400 bit/s
400 bit/s
4800 bit/s
4800 bit/s
200 bit/s
9600 bit/s
9600 bit/s
300 bit/s
19200 bit/s
600 bit/s
38400 bit/s
4200 bit/s
56000 bit/s
64000 bit/s
Link layer (network-specific parameter)
Frame format FT 1.2, signel character 1 and the fixed time out interval are used exclus-
ively in this companion standard.
Address field of the link
Link transmission procedure
not present (balanced transmission
only)
Balanced transmission
One octet
Unbalanced transmission
Two octet
structured
Frame length
unstructured
Maximum length L (number of octets)
When using an unbalanced link layer, the following 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:
Cause of transmission
Type identification
<1>
9, 11, 13, 21
A special assignment of ASDUs to class 2 messages is used as follows:
Cause of transmission
Type identification
133
COM600 series 5.0
1MRS758690
Master Protocols (Ethernet) and Applications Technical Refer-
ence Manual
Summary of Contents for COM600 series 5.0
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