GE B30 Communications Manual page 512

INTEROPERABILITY DOCUMENT
3. PHYSICAL LAYER
Transmission speed (control direction)
Unbalanced interchange
circuit V.24/V.28 standard

100 bits/sec.

200 bits/sec.

300 bits/sec.

600 bits/sec.

1200 bits/sec.
Transmission speed (monitor direction)
Unbalanced interchange
circuit V.24/V.28 standard

100 bits/sec.

200 bits/sec.

300 bits/sec.

600 bits/sec.

1200 bits/sec.
4. LINK LAYER
Link transmission procedure

Balanced Transmission

Unbalanced Transmission
6
Frame Length (maximum length, number of octets): Not selectable in companion IEC 60870-5-104 standard
When using an unbalanced link layer, the following Application Service Data Unit (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:

A special assignment of ASDUs to class 2 messages is used as follows:
5. APPLICATION LAYER
Transmission mode for application data
Mode 1 (least significant octet first), as defined in Clause 4.10 of IEC 60870-5-4, is used exclusively in this companion
standard.
Common address of ASDU

One Octet
 Two Octets
Information object address

One Octet

Two Octets
 Three Octets
6-2
Unbalanced interchange
circuit V.24/V.28 recommended
if >1200 bits/s

2400 bits/sec.

4800 bits/sec.

9600 bits/sec.
Unbalanced interchange
circuit V.24/V.28 recommended
if >1200 bits/s

2400 bits/sec.

4800 bits/sec.

9600 bits/sec.
Address field of the link

Not Present (Balanced Transmission Only)

One Octet

Two Octets

Structured

Unstructured
 Structured
 Unstructured
CHAPTER 6: IEC 60870-5-104 COMMUNICATION
Balanced interchange circuit
X.24/X.27

2400 bits/sec.

4800 bits/sec.

9600 bits/sec.

19200 bits/sec.

38400 bits/sec.

56000 bits/sec.

64000 bits/sec.
Balanced interchange circuit
X.24/X.27

2400 bits/sec.

4800 bits/sec.

9600 bits/sec.

19200 bits/sec.

38400 bits/sec.

56000 bits/sec.

64000 bits/sec.
UR FAMILY – COMMUNICATIONS GUIDE