CM10A serial controller RJ10 pinouts

[msg@xxxxxxxxx]

Greetings:

I needed to build a custom serial interface cable for the CM10A (also
known as IBM 75H8381) 2-way serial x10 controller; the reference
material on the 'Net describes the connector as RJ11 and numbers
the pins 1 through 4; only 6-pin RJ11 connectors have a pin 1 and
the four pin versions are numbered 2 through 5.  In fact the CM10A
uses an RJ10 connector which is numbered from 1 through 4.  Here
are the signal assignments for this connector:

  ---------------------------------------------------4  Signal GND
  |  ------------------------------------------------3   TxD
  |  |  ---------------------------------------------2   RI
  |  |  |  ------------------------------------------1   RxD
  |  |  |  |
--------------
| !  !  !  ! |
|            |
|_          _|   Plug, front end view
   |_    _|
     !--!

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Regards,

Michael Grigoni
Cybertheque Museum