D20/D200
Installation and Operations Guide
GE Energy
994-0078-2.00-7 General
28
Full
Familiarization, continued
Modems
Two D20 modems are available for communications to a host computer or to other
IEDs:
• WESDAC 202/V.23 is a 1200-baud Bell 202 or CCITT V.23 standard modem
designed for 300 to 1200 baud asynchronous operation on unconditioned lines
and supports the majority of SCADA/EMS applications. It is available in a 19"
rack mount or 3U vertical mount configuration in the D20 chassis.
• WESDAC 212/V.23 is a 1200-baud Bell 212 standard modem, (auto answer
only), used for dial-up access to the D20. This modem is available for mounting
only as a 3U vertical mount.
Third-party
Modems
Third-party modems can be used to meet specific customer requirements. These
modems are connected to the D20/D200 via standard RS-232 connections.
WESMAINT
Cable
For maintenance work on a D20 or D200 you will need a WESMAINT port cable to
connect to the D20 and D200. These are available in either 8’ or 15’ lengths.
Also use this type of cable to connect to Promaint for maintenance work on the D20
Peripheral I/O modules.
For WESMAINT cable DB-9 connector pinouts, see “WESMAINT Cable Pinouts”,
page 88.
I/O Peripherals
Peripheral I/O modules are intelligent modules containing an on-board
microprocessor. They are configured as slaves to the D20ME/ME II main processor.
In this way, specific I/O processing is distributed throughout the RTU to the
appropriate I/O module. There are five types of I/O peripherals:
• D20A analog input
• D20S digital inputs
• D20K digital output
• D20C combination input/output
• D20AC alternating current analog input
Optional High Voltage peripherals are available for the D20 and D200.
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