D20/D200
Installation and Operations Guide
GE Energy
994-0078-2.00-7 General
32
Full
Familiarization, continued
Promaint
Promaint is the maintenance facility for the peripheral modules. Use it to:
• View data
• Force control points to verify that the board is functioning correctly
• Calibrate a D20C Board
Note
Promaint access to the D20C board requires an additional daughter card,
the WESDAC D20C WESMAINT Interface: 540 –0162.
D.20 Peripheral
Link
Communications between the D20 main processor and the D20 peripheral I/O
modules are carried over a high-speed, high-level data link (HDLC) called the D.20
Link. The D.20 Link has the following features:
• RS-485 serial link, half duplex, 250 kbps
• D.20 protocol using HDLC format with Manchester encoding
• Supports up to 31 D20 I/O peripheral modules in a standard configuration
• Repeater/extension modules may be used to extend this limit to a maximum of
128 (D20) and 256 (D200) peripheral I/O modules
Media options:
• RS-485, 24 AWG twisted pair, for applications up to 330 meters
• Multi-Mode Glass Fiber (GFO), up to 2 km
• Plastic Fiber (PFO), up to 60 meters
Notes:
If you are using the D20 or D200 as a Master Data Concentrator, then the
D.20 Link connectors are not used.
The D.20 Link can also be used to supply power to peripherals on smaller
D20 horizontal slot chassis systems. See “Peripherals: Supplying Power”,
page 54.
Second D.20
Link
Redundant D.20 communication channels are available on all peripherals. Daughter
boards are required to support this functionality:
• Part number: 540-0207, for the A, S and K boards
• Part number: 540-0209 for the C board
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