rk@bigbroth.UUCP (rohan kelley) (05/15/89)
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 =======================================================================