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 DEC VAXstation

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:

Pin Number Signal Name
DTE Terminal or Computer
 
  DCE Modem
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   -->  

 

 

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