Toshiba GR200 Series Instruction Manual page 611

Interoperability
10.4.3
The IEC 60870-5-103 protocol provides a physical layer and an application layer for the
communication to secure the interoperability.
Physical layer
(i)
Either an electrical or an optical interface† is defined in the IEC 60870-5-103 standard.
Electrical interface in the RS-485
A maximum number of 32 relays is possible in the IEC 60870-5-103 standard.
Optic interface
Several optic communication modules are available
†Note: Either interface is provided with a communication module in the IED; the
specification is discussed separately. See chapter
processing and communication module
Application Layer
(ii)
The following layers are provided on the application layer:
COMMON ADDRESS of ASDU
One COMMON ADDRESS OF ASDU (identical with station address)
.
- 597 -
6F2S1931 (0.20)
Technical description: Signal
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)