Equinox Systems MEGAPORT, Справочник по аппаратуре

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48 Equinox MEGAPORT Hardware Reference Manual
DB-25 Wiring
Although not highly recommended by Equinox, it is possible to
use DB-25 type connectors with LD ports. This is especially
useful where existing wiring is to be used.
Figure 4-6 shows the cable connections for the distribution
panel between a MEGAPORT board and a terminal or printer.
The cable(s), provided with the LD board, must be used between
the DB-25 distribution panel (part number 990117) and the
MEGAPORT board. The specially wired cable to the terminal or
printer is not provided by Equinox. However, all necessary
RS-232 wiring information is detailed below under Special
Cable Pinouts.
Figure 4-6. MEGAPORT LD DB-25 wiring.
Terminal or
Printer
990117
Distribution Panel
End
DATA OUT(-)
3
DATA OUT(+)
8
DATA IN(-)
2
DATA IN(+)
20
2
TD
3
RD
7
Gnd
Pair 2
Pair 1
Terminal
or Printer
End
Note: In the cable, pairs 3/8 and 2/20 must be
twisted pairs. A 4-wire cable is required.
Connection of DATA OUT(+) and DATA IN(+)
must be done only at terminal or printer end.
➪➪➪➪➪
Special Cable Pinouts
Any LD Board
MEGAPORT Cable(s)
w/Telco Connector
Specially wired
RS-232 Cable
990117
Distribution
Panel