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   REPLYADDR jj@franjam.org.uk   
   REPLYTO 3:770/3.0 UUCP   
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   REPLY:  efd2881d   
   PID: SoupGate-Win32 v1.05   
   On 2024-01-12, 57r.1283 <57r.1283@etq5.net> wrote:   
   > On 1/7/24 2:50 PM, Jim Jackson wrote:   
   >> Indeed, which the max232 provides, +/- 12v. But it needs driving with 5v   
   >> logic levels. Hence the need for the 3v-to-5v level shifters BEFORE the   
   >> MAX232 inputs.   
   >   
   >   
   >    Probably true. I think the 3232 is 3.3 in/out so some kind   
                                           3.3  in and 5v tolerant   
      
   but +/- 5.5v out. For equipment that actually, meets the RS232 spec   
   is fine   
      
   >    of level-converter would be required between it and the 232.   
   >    Cheap, or you can make yer own, but it's an extra level of   
   >    complication.   
   >   
   >    Thing is, some of that old equipment (oft industrial) IS still   
   >    out there doing its job so a Fake-to-Real RS232 (might add a   
   >    couple other RS's) converter might be a worthwhile bit of kit   
   >    to have around.   
   >   
   >    There's also the issue of the flow-control lines. While modern   
   >    stuff is fast enough to not worry about it, the old equipment   
   >    might need to signal a brief stop while you are sending to it.   
   >    Buffers were often very small back then (and processing slow).   
   >   
   >    Async is versatile, but a pain in the rump sometimes. Synchronous   
   >    serial is more civilized. However most equipment you'll ever come   
   >    across is async.   
      
   --- SoupGate-Win32 v1.05   
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