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Jan Waclawek
12/16/05 02:59
Read: 734 times

#105335 - formal stuff
Responding to: Jon Ledbetter's previous message

first, it is great, please continue, just please don't overshoot it.

A couple of remarks, mostly formal:

  • you mention DCE (and DTE). One of the most confusing thing for newbies is the usage of such abbreviations (and after "decoding" to "Data Communication Equipment" it does not get clearer IMHO). I would call it "modem-like", "slave" or anything else, with the "DCE" following in brackets for the advanced reader.
  • formatting - I would recommend using block alignment of lines in paragraphs
  • I assume you used Word and exported via Adobe PDF distiller. Word has a stupid feature switched on by default - it automatically capitalizes after a fullstop. E.g. on page 21: "It's recognized as a comm. Port,...".
  • the tables on page 20 - I assume you have taken them over from some source, are you able to edit it? If yes, I would recommend to
    • rename TD and RD into the more common TxD and RxD
    • what they call there UART and should be DTE, call "PC(DTE)"; the "modem" is already there (maybe call it "modem(DCE)")
    • indicate the direction of signals in the table (PC->modem, PC<-modem)
    • in Functions table, group signals according to their function (and in order of importance - mentioning perhaps that the "less important" signals don't need to be connected in less demanding applications):

      • ground... well, ground is ground :-)
      • RxD+TxD - data (both directions)
      • RTS+CTS - hardware handshake ("throttling" data) (both directions)
      • DTR+DSR - indication of presence (both directions)
      • DCD+RI - in direction from modem to PC, used in real modems only

    • in the Functions table, the descriptions of signals are notoriously misleading. I would try to stress that the "names" of signals are from the viewpoint of PC and further use something like:

      • RxD - data flowing from modem to PC
      • TxD - data flowing from PC to modem
      • RTS - PC indicates to modem that it is ready or not to receive data
      • CTS - modem indicates to PC that it is ready or not to receive data
      • DTR - PC indicates to modem that it is present, switched on (if connected, sometimes used to clear a jam by simulating "non-presence" for a short time)
      • DSR - modem indicates to PC that it is present, switched on
      • RI - modem indicates to PC that it detects ringing on the connected phone line (somebody attempts to call the modem)
      • DCD - modem indicates to PC that a connection to an another modem has been established

  • also it is worth playing with the figures' format outside Word, inserting ready-made pictures into it (don't even resize them within Word). Also for this style of pictures the jpg format is not too well suitable. Try gif, or better png. Yields less blurry pictures and smaller files. For simple pictures manipulation I use IrfanView.

I hope this was not too much.

Jan Waclawek

List of 46 messages in thread
Feedback needed        Jon Ledbetter      12/12/05 13:29      
   Couple of ideas      Sasha Jevtic      12/12/05 14:24      
   Missing      Andy Neil      12/12/05 15:28      
      the source...      Jan Waclawek      12/12/05 16:10      
         Stupid EIA      Andy Neil      12/13/05 00:52      
      Maybe a Name change?      Jon Ledbetter      12/12/05 22:30      
         minor but annoying ...      Richard Erlacher      03/17/06 09:33      
   USB      Ian Bell      12/12/05 16:06      
      Limited Experience      Jon Ledbetter      12/12/05 22:43      
      known bad USB/serial      Jan Waclawek      12/13/05 01:56      
      FYI - Targus PA088      Jon Ledbetter      12/13/05 09:46      
   thoughts      Jan Waclawek      12/12/05 16:17      
      I am so stupid      Jan Waclawek      12/13/05 02:02      
         Kickstart      Jon Ledbetter      12/13/05 07:36      
   attribution      Steve M. Taylor      12/13/05 03:41      
   The ONE thing I always have to look up a      Erik Malund      12/13/05 08:03      
   Ok - Second revision, but still working,      Jon Ledbetter      12/15/05 14:16      
      Nice      Steve M. Taylor      12/15/05 15:12      
         OK      Jon Ledbetter      12/15/05 15:33      
         MAX202 vs. MAX232A      Jan Waclawek      12/16/05 02:32      
         or the 232A      Erik Malund      12/16/05 06:32      
      Polled; Interrupt      Andy Neil      12/16/05 00:39      
         polled tx      Jon Ledbetter      12/16/05 07:48      
            Assorted small ideas      Sasha Jevtic      12/17/05 00:19      
               Not a good idea      Kai Klaas      12/17/05 06:46      
                  Serial speeds?      Sasha Jevtic      12/17/05 08:41      
                     Enhanced specifications      Kai Klaas      12/18/05 06:38      
                        That's a strange spec      Sasha Jevtic      12/20/05 15:04      
      formal stuff      Jan Waclawek      12/16/05 02:59      
         formal      Jon Ledbetter      12/16/05 08:23      
            who's the intended audience      Jan Waclawek      12/16/05 09:15      
   3rd Revision      Jon Ledbetter      12/27/05 08:47      
      Busy?      Jon Ledbetter      01/03/06 12:23      
         more than a couple of comments...      Jan Waclawek      01/04/06 16:27      
            So.....      Jon Ledbetter      01/05/06 15:01      
               what I like or not...      Jan Waclawek      01/06/06 08:25      
                  comments      Jan Waclawek      02/28/06 05:18      
                     Comments on Comments      Jon Ledbetter      02/28/06 09:37      
                        bah...      Jan Waclawek      02/28/06 11:25      
                           more problems      Jan Waclawek      02/28/06 13:20      
                              RE: Problems      Jon Ledbetter      02/28/06 13:36      
                              Something Strange      Jon Ledbetter      02/28/06 13:57      
                                 Nope....      Jon Ledbetter      02/28/06 14:28      
                                    interrupt      Jan Waclawek      02/28/06 15:30      
   All members will enjoy      Ralph Sack      03/16/06 21:55      
   Intel serial intro app note      Sasha Jevtic      03/28/06 15:16      

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