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Text File  |  1994-02-12  |  3KB  |  73 lines
  1.                
  2.                  *** Homebrew Interface Schematic by IW3FQG ***
  3.  
  4.        +5V <-----------o------------------o----+           C = 10uF
  5.                        |                 +|    |           IC1 = 7404
  6.                        |              C | = |  |           IC2 = MAX232
  7.                        |                +-+-+  |
  8.                     14 |                2 |  16|
  9.    T         TXD  +----------+       +------------+     RXD
  10.    R    2  <------| 1      2 |-------|11        14|----------------> 3
  11.    A         RXD  |    I     |       |     I      |     TXD               R
  12.    N    3  <------| 4  C   3 |-------|12   C    13|----------------> 2    S
  13.    S         CTS  |    1     |       |     2      |     CTS
  14.    C    4  <------| 9      5 |-------| 9         7|----------------> 5    2
  15.    E         RTS  |          |       |            |     RTS               3
  16.    I    5  <------| 6      8 |-------|10         8|----------------> 4    2
  17.    V              +----------+       |           4|------+
  18.    E                    |7        +--|1 3  6  15 5|-+    |       +-> 7    C
  19.    R     1  <--+        |        +|  +------------+ |   +|       |        O
  20.               |      /////    C | = |  |  +|   |    |  | = | C   |        M
  21.             /////               +-+-+  | | = | |    |  +-+-+    ///       P
  22.                                   |    | +-+-+ |    |    |                O
  23.                                   +----+ C |   |    +----+                R
  24.                                           ///////                         T
  25.  
  26.  
  27.  1990 IW3FQG
  28.    
  29.   
  30.  Following parts obtained from JDR Microdevices, San Jose,Ca. 800-538-5000
  31.       IC1------7404 Hex Inverter (14pin IC socket pt# 14PIN ST)
  32.       IC2------MAX232CPE Dual RS232 trans/rec (16pin IC socket pt# 16PIN ST)
  33.       C--------10uf Tantalum caps
  34.       
  35.  The 6-pin DIN plug for the transciever connection is avalible from 
  36.  Radio Shack...cat# 276-020. As well as the 25 or 9 pin connector for
  37.  the comm port.
  38.  
  39.  The +5 volts can be easily obtained using a 9v battery and a 5v fixed
  40.  voltage regulator IC (R.S. cat# 276-1770)
  41.  
  42.                       _______
  43.                      | v.reg |
  44.                      |       |
  45.                      |       |
  46.                      |_______|
  47.                       |  |  |
  48.            ___________|  |  |____________ +5 volts>>>>
  49.           +|             |
  50.          -----           |     
  51.   9 volt  ---            |
  52.   bat.   -----           |
  53.           ---            |
  54.          - |_____________|
  55.                          |
  56.                      ////////
  57.  
  58.      The following is a the pin out difference
  59.   between a 25 pin and a 9 pin AT serial connector
  60.  
  61.  
  62.       RS232      SIGNAL      PC-AT (9pin)
  63.         2         txd          3
  64.         3         rxd          2
  65.         4         rts          7
  66.         5         cts          8
  67.         6         dsr          6  (not used in interface)
  68.         7         gnd          5
  69.         8         car det      1  (not used in interface)
  70.         20        dtr          4  (not used in interface)
  71.         22        ring ind     9  (not used in interface)
  72.  
  73.