modular null modem pinout?
rohan kelley
rk at bigbroth.UUCP
Tue May 16 00:09:46 AEST 1989
I'm trying to make a direct connect between a bell tech 386/25 and
a 3b2/400. The port on the 386 is an ace intelligent port board
with 8 modular ports and on the 3b2 an enhanced port board.
I'm trying to construct a modular null modem cable. This is the
wiring diagram I've come up with, but haven't tried it yet. Does
anybody know if this is correct?
386/ace board 3b2/enhanced ports board
1 G <-----------------------------------------> G
2 CTS <------| |-----------> CTS
| |
3 TDXO<......|........\/------------|-----------> TDXO
| /\ |
4 DTR <------|------\/ \/..........|...........> DTR
| /\ /\ |
5 RXDO<------|-----/ \/ \.........|............> RXDO
| /\ |
6 DCD <......|......./ \-----------|------------> DCD
| |
7 G <------|----------------------|------------> G
| |
8 RTS <------| |------------> RTS
What I'm trying to say is:
G 1 to 1 G
CTS 2 tie to 8 (plug)
TDXO 3 to 5 RXDO
DTR 4 to 6 DCD
RXDO 5 to 3 TDXO
DCD 6 to 4 DTR
G 7 to 7 G
RTS 8 tie to 2 (plug)
Neither the 386 or 3b2 have DSR (RS232 pin 6) which is usually tied to
DTR. Is it needed?
=======================================================================
Rohan Kelley -- UNIleX Systems, Inc. (Systems and software for lawyers)
UUCP: ...{gatech!uflorida,ucf-cs}!novavax!bigbroth!rk (office)
novavax!mdlbrotr!rk (home)
ATTmail: attmail!bigbroth!rk
3365 Galt Ocean Drive, Ft. Lauderdale, FL 33308 Phone: (305) 563-1504
"Go first class or your heirs will" -somebodyelse
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