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???
05/09/05 17:23
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 		 #93243 - Rx Tx pins
Responding to: ???'s previous message
Hi Nahid
What people are trying to tell you is that if microcontroller talks to PC serial port and Modem talks to PC serial port, for microcontroller to talk to modem you need to reverse the Tx and Rx pins on either the modem port or the MAX232 chip of the microcontroller board.
Mahmood

List of 26 messages in thread
TopicAuthorDate
interfacing serial modem with 89c51??            01/01/70 00:00      
   rs232 level converter.            01/01/70 00:00      
      interfacing serial modem with 89c51??            01/01/70 00:00      
   Modem Settings            01/01/70 00:00      
      interfacing serial modem with 89c51??            01/01/70 00:00      
         Read the modem manual!            01/01/70 00:00      
            interfacing serial modem with 89c51??            01/01/70 00:00      
               Evaluate what is different            01/01/70 00:00      
                  interfacing serial modem with 89c51??            01/01/70 00:00      
                     Modem            01/01/70 00:00      
   Rx Tx pins            01/01/70 00:00      
   interfacing serial modem with 89c51??            01/01/70 00:00      
      connecting the front end of two cars            01/01/70 00:00      
         Errr...what did I mention earlier?            01/01/70 00:00      
            interfacing serial modem with 89c51??            01/01/70 00:00      
               Still            01/01/70 00:00      
   Modem sinulator on PC            01/01/70 00:00      
      Protocol analyzer            01/01/70 00:00      
         interfacing external modem to at89c51            01/01/70 00:00      
            How do you know?            01/01/70 00:00      
   command Timing            01/01/70 00:00      
      command timming            01/01/70 00:00      
   I don't want to give any secrets away!            01/01/70 00:00      
      please help !!            01/01/70 00:00      
         SCOPE            01/01/70 00:00      
         STOP trying to fix it, learn what it is.            01/01/70 00:00      

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