Toshiba GR-200 Series Instruction Manual page 842

Interoperability
11.5.4
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 optical interface† is defined in the IEC 60870-5-103 standard.
Electrical interface of RS-485
When a RS485 module is selected for the IEC 60870-5-103 serial, 32 IEDs are possible
to connect in.
Optic interface
Fiber optic module is available for the IEC 60870-5-103 serial.
†Note: Either interface is provided and that specification is discussed separately. See
chapter
(→page 528).
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)
Technical description: Signal processing and communication module
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6F2T0200 (0.15)
GRE200 (1,2)