Signals of the RS-232 Port / Belegung der RS232 Schnittstelle:


9 Pin

25 Pin

Designation of Signal

Type

1

8

CD (Carrier Detection)

input

2

3

RxD (Recieve Data)

input

3

2

TxD (Transmit Data)

output

4

20

DTR (Data Terminal Ready)

output

5

7

GND (Ground)

ground

6

6

DSR (Data Set Ready)

input

7

4

RTS (Request To Send)

output

8

5

CTS (Clear to Send)

input

9

22

RI (Ring Indicator)

input




ASCII Schematic of the Hardware / ASCII Schaltplan der Hardware: 

         ____
DTR ____| R1 |_____
        |____|     |
          10 kohm  |                     S1
                   |____________________/ _________________ CD
                   | 
                   |                     S2
                   |____________________/ _________________ CTS
                   |
                   | 
                   |                     S3
                   |____________________/ _________________ DSR
                   |
                   | 
                   |                     S4
                   |____________________/ __________________ RI
                   |
                   |
                   |
                   |                 S5
                   |________________/ _____________|\|______ CTS
                   |                         |     |/|
                   |                         |
                   |                         |
                   |                         |_____|\|______ DSR 
                   |                               |/|
                   |
                   |
                   |                 S6
                   |________________/ _____________|\|______ CTS
                   |                         |     |/|
                   |                         |
                   |                         |
                   |                         |_____|\|______ CD 
                   |                               |/|
                   |
                   |
                   |                 S7
                   |________________/ _____________|\|______ CD
                                             |     |/|
                                             |
                                             |
                                             |_____|\|______ DSR 
                                                   |/|

         ____
DTR ____| R2 |_____
        |____|     |
          2.2 kohm |
                   |                             LED-red 
                   |_____________________________|/|______ GND
                                           |     |\|
                                           |
                                           |     LED-green
                                           |_____|\|______ GND 
                                                 |/|



         ____                                  LED-yellow                  
 RTS____| R2 |_________________________________|\|______ GND
        |____|                                 |/|
          2.2 kohm


Comment from Andreas Schockenhoff(Please delete REMOVE from the e-mail adress) for a Toshiba Laptop:
I had to change the 10 kohm to 3.3 kohm, otherwise only Buttons 1 to 4 worked.



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This Page was created by Peter Pfrang. Last modification 2001-10-04.