DEC 3000 trouble

On 10 Aug, Tom Owad wrote: 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