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  1.             comTAP Serial Data Cable Specification
  2.  
  3.  
  4. You must connect pins 3 and 7 (DB-25 version) or 2 and 5 (DE-9
  5. version) to monitor data.  The cross connections from DTE: 22-20 and
  6. DCE: 22-4 (DB-25 versions) or DTE: 9-4 and DCE: 9-7 (DE-9 versions)
  7. are optional but recommended, as they support automatic device
  8. detection.  Connect the shells labeled DTE and DCE to the MONITORING
  9. computer.  The horizontal cable at the bottom of the diagram connects
  10. the two devices under test and should be a normal RS-232 cable.
  11. Remember, if you are connecting two DTE devices with the RS-232
  12. cable, you must include a null modem converter or swap pins 2 and 3
  13. at one end of the cable.
  14.  
  15.  
  16.                          Monitoring Computer Shells
  17.  
  18.  
  19.                         DTE                       DCE
  20.                   Monitoring Port           Monitoring Port
  21.                      Connector        |        Connector
  22.                                       |
  23.        DE-9     9     2     5     4   |    9     2     5     7
  24.                                       |
  25.        DB-25   22     3     7    20   |   22     3     7     4
  26.                 |     |     |     |   |    |     |     |     |
  27.                 +-----|-----|-----+   |    +-----|-----|-----+
  28.                       |     |         |          |     |
  29.                       |     |         |          |     |
  30.                       |     |         |          |     |
  31.                       |     |         |          |     |
  32.                       |     |         |          |     |
  33.                       |     |         |          |     |
  34.                       |     |                    |     |
  35.          2 -----------+-----|--------------------|-----|--------
  36.          3 -----------------|--------------------+-----|--------
  37.          4 -----------------|--------------------------|--------
  38.          5 -----------------|--------------------------|--------
  39.          6 -----------------|--------------------------|--------
  40.          7 -----------------+--------------------------+--------
  41.            Connect the two devices under test with this standard
  42.            RS-232 cable. The monitoring tap connectors hook to
  43.            a separate PC with two serial ports. Monitoring is
  44.            passive - we do not use pass-through - so that timing
  45.            of the transmissions is not affected in any way.
  46.  
  47.  
  48.  
  49.    
  50.    Connections support data only; signal information is not included.
  51.  
  52.  
  53.                               Pinout List
  54.                              -------------
  55.  
  56.                          DE-9  |  RS-232  |  DB-25
  57.                 ---------------+----------+----------
  58.                            9   |     x    |    22
  59.                 DTE        2   |     2    |     3
  60.                            5   |     7    |     7
  61.                            4   |     x    |    20
  62.                 ---------------+----------+----------
  63.                            9   |     x    |    22
  64.                 DCE        2   |     3    |     3
  65.                            5   |     7    |     7
  66.                            7   |     x    |     4
  67.