GE Energy
D20/D200
Installation and Operations Guide
General 994-0078-2.00-7
Full
33
Familiarization, continued
Extended
Communi-
cations
To extend communications to multiple peripherals, use the D.20 Communications
Interface or the D.20 Splitter, each of which will allow peripherals to be sited
remotely from the D20.
In conjunction with the D.20 RS-485 Adaptor, the D.20 Communications Interface
acts as a communication repeater to overcome the limit of 31 peripherals on a single
RS-485 link.
The D.20 Communications Interface can be used in conjunction with any of the
following plug-in adaptors:
• D.20 RS-485 Interface
• GFO/PFO Adaptors
The D.20 Splitter can be used only with the GFO/PFO adaptors.
D.20 Comm
Interface
Use the D.20 Communication Interface module when you require one-to-one
communication links with peripherals.
D.20 Splitter
Use the D.20 Splitter when you require one-to-four communication links with
peripherals, especially if peripherals are clustered in different areas of the substation.
D.20 RS-485
Interface
The D.20 RS-485 Interface provides the repeater function, which can only be
implemented on the D.20 Communications Interface.
GFO and PFO
Adaptors
Glass Fiber Optic (GFO) and Plastic Fiber Optic (PFO) adaptors are used to provide
either glass or plastic fiber optical cable extensions to the D.20 Link. These allow
interference free links to peripherals that are sited at a remote distance from the main
D20 installation.
Extended
Power
When power requirements for multiple peripherals exceed the base system
limitations, use the D.20 DC Interface module.
D.20 DC
Interface
The D.20 DC Interface module is used:
• As power input for additional peripherals on a D.20 Link
• For power supply to peripherals on a D200 vertical slot multi-node
implementation which cannot use the D20 Link for peripheral power supply
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