Db-25 Wiring - Equinox Systems 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.
Any LD Board
DATA OUT(-)
DATA OUT(+)
DATA IN(-)
DATA IN(+)
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.
48
MEGAPORT Cable(s)
w/Telco Connector
Special Cable Pinouts
990117
Distribution Panel
End
3
Pair 1
8
2
Pair 2
20
Figure 4-6. MEGAPORT LD DB-25 wiring.
Equinox MEGAPORT Hardware Reference Manual
990117 Specially wired
Distribution RS-232 Cable
Panel
Terminal
or Printer
End
2
3
7
Terminal or
Printer
TD
RD
Gnd