CHAPTER 1: BEFORE YOU START
D20MX HARDWARE USER’S MANUAL GE INFORMATION 23
Modems
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.
Peripherals
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
580 - 2006 F1 Line/+DC Input 4 A / 250 V
F2 Neutral/-DC Input 4 A / 250 V
580 - 2007 F1 Line/+DC Input 4 A / 250 V
F2 Neutral/-DC Input 4 A / 250 V
Power Supply Fuse Fuse Function Replacement Fuse
(¼inch by 1 ¼ inch Time Delay)
PCOMMON Description Version Compatibility with D20MX
P022 - PCOMMON for D20C 3.05, 3.00 are compatible
2.21 and earlier are NOT compatible
P010 - PCOMMON for D20A, D20S and D20K 3.06, 3.05, 3.01, 3.00 are compatible
2.21 and earlier are NOT compatible
P087 - pBOOT for D20AC 1.04, 1.03, 1.02 are compatible
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