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CHAPTER 1: BEFORE YOU START
Modems
Peripherals
D20MX HARDWARE USER'S MANUAL
Power Supply
Fuse
580 - 2006
F1
F2
580 - 2007
F1
F2
D20 modems (can be purchased separately) for communications to a host computer or to
other IEDs.
For example, 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 3U (GE part number
520-0120) vertical mount configuration in the D20 chassis; the 19 inch rack mount (GE part
number 520-0090) version is currently not supported.
Third-party modems can be used to meet specific requirements. These modems are
connected to the D20 via standard RS-232 connections. Contact GE Digital Energy for
more information on options.
Peripheral I/O modules are intelligent modules containing an on-board microprocessor.
They are configured as slaves to the D20MX processor board. 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 also available.
The D20MX is only compatible with certain peripheral common code (i.e., pcommon)
versions as defined in Table 9.
Table 9: PCOMMON versions compatible with the D20MX
PCOMMON Description
P022 - PCOMMON for D20C
P010 - PCOMMON for D20A, D20S and D20K
P087 - pBOOT for D20AC
GE INFORMATION
Fuse Function
Replacement Fuse
(¼inch by 1 ¼ inch Time Delay)
Line/+DC Input
4 A / 250 V
Neutral/-DC Input
4 A / 250 V
Line/+DC Input
4 A / 250 V
Neutral/-DC Input
4 A / 250 V
Version Compatibility with D20MX
3.05, 3.00 are compatible
2.21 and earlier are NOT compatible
3.06, 3.05, 3.01, 3.00 are compatible
2.21 and earlier are NOT compatible
1.04, 1.03, 1.02 are compatible
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