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???
02/20/07 07:40
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 		 #133286 - It's the application, not the PC
Responding to: ???'s previous message
Richard Erlacher said:
PC's require special wiring, i.e. pins 4 and 5, and pins 6, 8, and 20 (based on the DB25 model) have to be connected together, else the PC won't talk.

Not true!

As Chris Kelly says, this has nothing specifically to do with it being a PC - the application may require it, but the PC itself most certainly can work with just 3 wires.

Way back in the days of MS-DOS, things like
Save This Code
 COPY file COM1:
did require the flow control lines to be properly asserted - eg, by use of loopbacks - but any application could configure the port for 3-wire operation.


List of 30 messages in thread
TopicAuthorDate
how do we test whether MAX232 is working            01/01/70 00:00      
   V+ and V-            01/01/70 00:00      
   Can I conclude then...            01/01/70 00:00      
      checking for working of serial port            01/01/70 00:00      
         You have excluded the most obvious first?            01/01/70 00:00      
   Be sure the cable is wired correctly            01/01/70 00:00      
      3 Wire            01/01/70 00:00      
         That doesn't seem to work with my old notebook            01/01/70 00:00      
            Configure the terminal program correctly            01/01/70 00:00      
               So far, It's never been an issue            01/01/70 00:00      
                  It's the application, not the PC            01/01/70 00:00      
      It's the application, not the PC            01/01/70 00:00      
         I have routinely done this in the past            01/01/70 00:00      
            Ive seen it working...            01/01/70 00:00      
               You missed my point            01/01/70 00:00      
                  Better safe than sorry, Eh?            01/01/70 00:00      
                     it's not all in the application            01/01/70 00:00      
                        but the OP stated            01/01/70 00:00      
                           True enough ...            01/01/70 00:00      
                        Now, now, we don\'t split hair do we?            01/01/70 00:00      
                           keep splitting :-)            01/01/70 00:00      
                           I've been fiddling with RS232 connections ...            01/01/70 00:00      
                     Ok, enough of twist and turn....            01/01/70 00:00      
                        I don\\\'t see what\\\'s not straight about this            01/01/70 00:00      
                           This has gone far enough.            01/01/70 00:00      
                              Guys, guys            01/01/70 00:00      
                              OK ,,, I see what you mean            01/01/70 00:00      
   @site administrator            01/01/70 00:00      
   @site administrator            01/01/70 00:00      
      Again... What was the solution?            01/01/70 00:00      

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