                          


          ⥬ ࠢ騥 ᨣ  ॡ㥬 殮  ᨭ-
஭ 裡 । १ ࠥ  ⠪  2-31.  -
    ६祪.   ६祪 롨ࠥ ࠡ  
RS-232-C,   ⮪ ⫥. 㣮  ६祪 롨ࠥ   
ᮢ  .  ࠧ,  ⥬   ᯮ짮 -
  .
            ணࠬ㥬  ন  ⮫쪮  ᨭ஭
.    㡨ࠥ ⮢ , ⮯    ஫ 
⭮. ணࠬ㥬  ᪮ ᪠ ࠡ   ᪮  
50  9600 . ন । 5, 6, 7  8   1, 1.5  2 ⮯-
 ⠬. ⥬ 뢠  ਮ⮬ ࠢ ਥ, ।祩, 訡-
, ﬨ ﭨ  . ᪨  ᯥ稢 -
 몠 ਥ।稪  ᨣ 室/室.
          楬     INS8250   㭪樮 .
   襯᫥,  ᫥騥 ᮡ:
          *   ਧ ࠭ 室 筮 ᨭ-
          樨;
          * ᨬ ⠪஢ ਥ;
          * 㭪樨 ࠢ  : ⮢  । (CTS); ⮢-
               ࠡ (DSR);   । (DTR); 
             (RI); । ।  (DCD);
          * ।  ⮢ ;
          *   । ࠧ뢠 楯;

          ⮪ 裡  㭪樥 ப஢ ⥬  -
  㦥 ०, 祬  㤥 ࠡ.  室 䥩
 ﭨ ࠢ ᨣ   ࠡ⠭ ⥬ ணࠬ
ᯥ祭.  ᫥饬 㭪  -奬 ᨭ஭ 
裡.


                   

                    ------------               -------------
         設      |     |    롮    | ᨭ஭ |
        ---------->|            |------------>|      |
             |      |  ⠫   |  裡      |
                    ------------              |    8250     |
                  設                  |             |
        ------------------------------------->|             |
                  뢠                  |             |
        ------------------------------------->|             |
                     ------------             |             |
                    |   |----------->|             |---
                    | 1.8432  |            |             |   |
                     ------------       ----->|             |   |
                     -----------       |      |             |   |
                    | ਥ |------|      |             |   |
                    |   EIA     |      |       -------------    |
                     -----------       |                     ---
                          ^            |      ------------  |    ----------
                          |            |     |   ⮪  | |   | ନ஢|
                          |             ---->|       |---->| ⥫ EIA |
                          |                   ------------       ----------
                          |                    ^         |            |
                          |                    |---------V            |
                          |                    |         |            |
                           --------------------|         |<-----------
                                                ---------
                                      25-⠪ ࠧ' D-⨯



                               

          ० ࠡ 롨 ⥬ ணࠬ஢  ᨭ஭-
    裡  8250.   믮 롮஬  /뢮(3F8 
3FF-ࢨ, 2F8-2FF-)   室   .   -
  0,  1  2 롨 ࠧ ॣ  । ० ࠡ.
஬ ⮣,  롮 । ॣ஢ ᯮ DLAB -  ਣ
ࠧ 㯠 (7) ॣ ࠢ .


                             /
=============================================================================
| /뢮|   롨ࠥ ॣ            | ﭨ DLAB       |
|------------------|                                 |                      |
|ࢨ. |. |                                 |                      |
| |  |                                 |                      |
|--------|---------|---------------------------------|----------------------|
|  3F8   |  2F8    |   TX                       | DLAB=0 ()      |
|  3F8   |  2F8    |   RX                       | DLAB=0 (⥭)      |
|  3F8   |  2F8    |訩  ॣ            | DLAB=1               |
|        |         |ࠧ                       |                      |
|  3F9   |  2F9    |訩  ॣ            | DLAB=1               |
|        |         |ࠧ                       |                      |
|  3F9   |  2F9    |ॣ ࠧ襭 뢠    |                      |
|  3FA   |  2FA    |ॣ 䨪樨 뢠|                      |
|  3FB   |  2FB    |ॣ ࠢ         |                      |
|  3FC   |  2FC    |ॣ ࠢ        |                      |
|  3FD   |  2FD    |ॣ ﭨ           |                      |
|  3FE   |  2FE    |ॣ ﭨ          |                      |
=============================================================================


                                 

=============================================================================
|    3F8-3FF     2F8-2FF               |                              |
|--------------------------------------------|                       |
| 9| A8| A7| A6| A5| A4| A3| A2| A1| A0|DLAB|                              |
|---|---|---|---|---|---|---|---|---|---|----|------------------------------|
| 1 | 10| 1 | 1 | 1 | 1 | 1 | * | * | * | 0  | ਥ (⥭)      |
|   |   |   |   |   |   |   | 0 | 0 | 0 | 0  |ॣ ࠭ ।稪  |
|   |   |   |   |   |   |   |   |   |   |    | ()                     |
|   |   |   |   |   |   |   | 0 | 0 | 1 | 0  |ࠧ襭 뢠         |
|   |   |   |   |   |   |   | 0 | 1 | 0 | *  |⨢ 뢠      |
|   |   |   |   |   |   |   | 0 | 1 | 1 | *  |ࠢ              |
|   |   |   |   |   |   |   | 1 | 0 | 0 | *  |ࠢ             |
|   |   |   |   |   |   |   | 1 | 0 | 1 | *  |ﭨ                |
|   |   |   |   |   |   |   | 1 | 1 | 0 | *  |ﭨ               |
|   |   |   |   |   |   |   | 1 | 1 | 1 | *  | ᯮ               |
|   |   |   |   |   |   |   | 0 | 0 | 0 | 1  |ॣ ࠧ (LSB)      |
|   |   |   |   |   |   |   | 0 | 0 | 1 | 1  |ॣ ࠧ (MSB)      |
|===========================================================================|
| :8  㤥  ࠢ 1  । ,  ࢨ筮, |
|   ᪮ 0  । ,  ୠ⨢ (  -|
|   ᭮ ६窮   ).  2, A1  A0 ᯮ-|
|    롮 ࠧ ॣ஢ ⠫ 裡.                      |
=============================================================================


                                 뢠

         ᯥ稢   뢠.  뢠 IRQ4   ࢨ-
     IRQ3 -  筮.   ⨢ ஢ "1". 
⮣ ⮡ ࠧ   裡 뫠 뢠   ⥬,  -
   ⠭  "1" 3  ॣ ࠢ .  ⮩ 窨 -
,    뢠, ࠧ襭   ॣ  ࠧ  뢠-
,  ਢ  뢠. ଠ  㤥 ᫥騩:

 ----------        --------------------------------------------------
 ન஢-|.| D0 | D1 | D2 | D3 | D4 | D5 | D6 | D7 |  |⮯|
  ।.|   |    |    |    |    |    |    |    |    |.| |
  ᨣ  ----------------------------------------------------      -------

            "0" -   ,  ।  ਭ.
 ⮬᪨ ⠢ ⮢ ,  ⭮ (᫨  ண-
஢),  ⮯  (1, 1.5  2,  ᨬ    ॣ
ࠢ ).



                            

          裡 ᯥ稢 䥩,  EIA RS-232C.   -
祭  ࠧ  譨 ன ।ᬮ७ 25 ⠪ ࠧ' D-⨯
(). ஬ ⮣,    ࠧ'   뢥 ⮪  .  
롮 ⮪ ⫨  RS-232   ६祪.
         䥩  ⮪  ⫨ ।ᬮ७  祭  ⨯
ਭ஢,  ᯮ  ⨯ 䥩.


                       
         18                 + 砥  (אַ)
         25                 - 砥  ()
          9                 + ।  ()
         11                 - ।  (אַ)


                           .
                                              49.9 
                                               ___
  । 奬                   +5 0----[___]--------------->.9
                ---             100 
 .    |1  |            ___
 --------------|   0-----------[___]------------------------------>.11
               |   |
                ---

  奬 ਥ                 5.6 
                                  ___
                               --[___]--- +5
           ____________       |                    ---          ਭ
 .18  |            |      |                   |1  |         
 <--------|---       __|______|___________________|   0------------
          |  +|    |/  |                          |   |
          |  _V   -|   |                           ---
 .25  |   |    |\__|_______
 <--------|---         |       |
          |____________|       |
                              ===

         䥩 RS-232C  ᫥⥫ 䥩ᮬ,    -
ন । ࠫ騥 ᨣ  ,   ᫥ :

       ⠪                 祭                   ࠢ
         2                  ।  (TD)           OUT
         3                  ਭ  (RD)             IN
         4                    । (RTS)           OUT
         5                  ⮢  । (CTS)         IN
         6                  ⮢   ࠡ (DSR)       IN
         7                  騩 (GND)                         -
         8                  । ।  (DCD)   IN
        20                  ⮢   ࠡ (DTR)      OUT
        22                   맮 (RI)               IN

          ८ࠧ  ᨣ / TTL ஢  ஢  殮
EIA.  ᨣ ਭ   ࠢ騬 ⠫ 裡. 
ᨣ   ⠭ ⥬ ணࠬ ᯥ祭  ।
ﭨ 䥩  ਩ ன⢠.


                         .

       ============================================================
       | 殮 |  筮   |  ᫮     |   㭪 . |
       |      |  ﭨ  |  ᨣ     |   䥩ᮬ  |
       |------------|-------------|--------------|----------------|
       |            |             |              |                |
       |⥫.|     0       |   ய    |        ON      |
       |⥫.|     1       |   થ     |        OFF     |
       ============================================================


                              饭 ஢
     +15   -------------------------------------------------------
                                  㭪 ON
     +3    ---3 -----------
                              饭 ஢
     -3    3 --------------
                                  㭪 OFF
     -15   --3 ------------
                              饭 ஢

         㤥  ,    ᨣ 室  થ୮ ﭨ, 
殮  奬 裡, ७  ஭ 䥩,  -3  -
 -15. 㤥 ,  ᨣ 室  ﭨ ய᪠,  -
殮  奬 裡, ७  ஭ 䥩,  +15  
+3. ⠫ 祭 殮   饭묨.
          ।  થ୮ ﭨ 㤥 ᯮ짮  -
祭 筮 ﭨ 1,  ﭨ ய᪠ -  祭  筮-
 ﭨ 0.
           奬 ࠢ 䥩ᮬ 믮 㭪 ON  ஢
殮  +3  ⭮襭  ᨣ쭮 ,  㭪 OFF -  -
殮  -3  ⭮襭  ᨣ쭮 .



                  INS8250


          ᠭ 祭  뢮 INS8250.    -
 뫪  ७  ⠫.
         :  ᫥饬 ᠭ  ஢ ⠥ ᪨
㫥  (쭮  0),    ᮪ ஢ - ᪮ 楩 (쭮
2.4).

