How to build your own DEC VAXstation 3100 serial cable

  1. Buy a 6-conductor phone cord.
  2. On ONE end of cord ONLY: Tear off clip from modular plug.
    Use fine saw to saw off remaining bump from clip.
    Use rough then fine sandpaper to smooth out plastic where clip was.
  3. Buy a wire-it-yourself FEMALE-DB9 -to- FEMALE-RJ45 adapter.
  4. Plug OTHER end of 6-conductor phone cord into RJ-45 jack in adapter.
  5. Wire up adapter as follows:
     1 2 3  4 5 6
     | | |  | | |
    || | |  | | ||   Bare conductors facing you.
    || | |  | | ||
    |            |
    ----\---/----|
        |   |
        |   |
    MMJ                DB9
     1  brn    - dtr -  4
     2  yel    - tx+ -  3
     3  grn    - tx- -  5
     4  red    - rx- -  5
     5  blk    - rx+ -  2
     6  orange - dsr -  6
    
    ------------- --------------
    \ 1 2 3 4 5 / \ 5 4 3 2 1 /
     \ 6 7 8 9 /   \ 9 8 7 6 /
       -------       -------
          Male       Female
    
    Phone jack  DB-9 jack
    ----------  ---------
        1           5
        2           4
        3           2
        4           5
        5          snip
        6           6
               snip 7,8,9
    
  6. Plug sanded-down end of 6-conductor phone cord into PRINTER PORT on VAX.
  7. Set Dip switch 3 (the one between SERIAL PORT 2 and the LED lights) UP.

Now you will need a null modem adaptor to attach a VT100 terminal to the VAX using this cable and adapter.

 

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