On 10 Aug, Tom Owad wrote:
> Ok, I got ahold of a 6-prong telephone cable, clipped the tab, and
> soldered connected it to a DB25 cable using the following pinout:
Hmm. The MMJ port is differential. So you have to connect pins 3 and 4
of the MMJ to GND, pin 7, on the DB25. Pin 2 is TXD and 5 is RXD on the
MMJ. They have to go to the pins 2 and 3 on the DB25. I don't know what
wiring form the folowing I used (I think it was H8575-A), but at least
one should work:
http://anacin.nsc.vcu.edu/~jim/mvax/pinouts.html
--- schnipp ---
6-pin modified modular jack (MMJ) used for serial ports on the VAXstation.
DEC carries four DB-to-MMJ adaptors. They are internally wired as follows
Rdy Out TX+ TX- RX- RX+ Rdy In
Adaptor Gender 1 2 3 4 5 6 Use with:
--------------------------------------------------------------------------
H8575-A F 20 2 7 7 3 6&8 VTxxx terminal
H8571-C M 6 3 7 7 2 20 DEC printer
H8571-D M 6 3 7 7 2 20 Modem
H8571-E M 20 2 7 7 3 6&8 Female terminal
or LaserWriter
--------------------------------------------------------------------------
RS-232 using DB-25 connectors:
DTE DCE
Terminal Modem
or computer
Pin Number Signal Name
2 TD Transmit Data -->
3 RD Receive Data <--
7 GND Ground ---
6 DSR Data Set Ready <--
8 DCD Data Carrier Detect <--
20 DTR Data Terminal Ready -->
--- schnapp ---
--
tschuess,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz
Received on Fri Aug 10 2001 - 16:23:41 BST