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  1. Newsgroups: comp.sys.cbm
  2. Path: sparky!uunet!usc!sol.ctr.columbia.edu!ira.uka.de!math.fu-berlin.de!zrz.tu-berlin.de!cs.tu-berlin.de!nevs
  3. From: nevs@cs.tu-berlin.de (Sven Goldt)
  4. Subject: rs232
  5. Message-ID: <1992Sep8.084954.10872@cs.tu-berlin.de>
  6. Sender: news@cs.tu-berlin.de
  7. Organization: Techn. University of Berlin, Germany
  8. Date: Tue, 8 Sep 1992 08:49:54 GMT
  9. Lines: 83
  10.  
  11.  
  12. This is a plan for building your own rs232-interface.
  13. No guarantee.
  14.  
  15.                         O   O       O O  O           RS232 - PINS
  16.                         |   | /""\  | |  |
  17.                      O  | O | O O | O O  O  O
  18.                      |  | | |  /  |     /   | 
  19.                      |  | | | /   |    /     \O
  20.                      |  O | O | O | O | O O O
  21.                      |   /   /  | | | | | \ \
  22.                      |   |  /   O | O | \  O |
  23.                      |   |  |     |   |  \   |
  24.                      |   |  | |""""    \  O  O
  25.                      |   |  | |         |
  26.                      |   |  | | O"""""""O"""""\
  27.                      |   |  | |                \
  28.                     /    |  \ """""""""""""""\  \
  29.                    /     |   """""""""""\     \  \
  30.                 || ||"|| || || || || || || || || ||
  31.                 || || || || || || || || || || || ||  USERPORT - PLUG
  32.  
  33.  
  34. Hardware:
  35. =========
  36. 1 Chip MAX 232
  37. 4 El.Condensators 22 uF / 16 Volt
  38. 1 Userport - Plug with Userport - box
  39. 1 Platine
  40.  
  41.  
  42. Look with Hardware on Platine:
  43. ==============================
  44.  
  45.                 RS232-PINS    
  46.  
  47.                 GND TXD CTS  RTS RXD
  48.                 7    2   5    4   3
  49.                 O    O   O    O   O
  50.  
  51.                 ===================
  52.  Bridge to        |o o o  o  o o o o|
  53.  Pin 2 (+5V)    |    MAX 232      |
  54. =========o        |o o o  o  o o o o|
  55. of the U-Port   ===================
  56. (Pin 2 to Pin 16 of MAX232)
  57.                  +       +
  58.                  //       //      //     Condensators
  59.             \\                        +
  60.             +                    
  61.  
  62.  
  63. MAX232 - Connections:
  64. =====================
  65.  
  66.                        + /\  + /\  + /\  + /\
  67.                          = |   = |   = |   = |  CONDENSATORS
  68.                          | |   | |   | |   | |
  69.                     16 =======================
  70. +5V      2   ----------|                     |
  71.                        |     MAX 232         |
  72.                     11 |                     | 14
  73. PA2      M   ----------|                     |--------  TXD
  74.                     10 |                     |  7
  75. PB1      D   ----------|                     |--------  RTS
  76.                     12 |                     | 13
  77. PB6      K   ----------|                     |--------  CTS
  78.                      9 |                     |  8
  79. FLAG2    B   -----O----|                     |--------  RXD
  80.                   |    |                     |
  81. PB0      C   -----|    |                     |
  82.                     15 |                     |
  83. GND      N   ------O---|                     |
  84.                 |      =======================
  85.                 |=====================================  GND  
  86.  
  87. --
  88. *******************************************************************************
  89. *  feel free to mail to nevs@cs.tu-berlin.de    /"/ /"| / /""                 *
  90. *  nevs = Sven Goldt                           / / /" |/  "/                  * 
  91. *                                             ' ' '"  " """                   * 
  92. *  # THE MOST IMPORTANT FINANCIAL QUESTION IS:  Where is the money ? #        *
  93. *******************************************************************************
  94.