ABB COM600 series 5.0 Technical Reference Manual page 65

1MRS758692 COM600 series 5.0
Slave Protocols (Ethernet) and Applications Technical Refer-
ence Manual
Transmission speed (monitor direction)
Unbalanced interchange cir-
cuit V.24/V.28 Standard
400 bit/s
200 bit/s
300 bit/s
600 bit/s
4200 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.
Link transmission procedure
Balanced transmission
Unbalanced transmission
Frame length
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:
Type identification
9, 11, 13, 21
A special assignment of ASDUs to class 2 messages is used as follows:
Type identification
Unbalanced interchange cir-
cuit V.24/V.28 Recommended
if > 1200 bit/s
2400 bit/s
4800 bit/s
9600 bit/s
Address field of the link
not present (balanced transmission
only)
One octet
Two octet
structured
unstructured
Cause of transmission
Cause of transmission
Balanced interchange circuit
X.24/X.27
2400 bit/s
4800 bit/s
9600 bit/s
19200 bit/s
38400 bit/s
56000 bit/s
64000 bit/s
<1>
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