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Michael Karas
05/26/13 17:18
Read: 1047 times
Beaverton Or
USA


 
Msg Score: +2
 +2 Good Answer/Helpful
#189802 - Not Awways the USB Converter's Fault
Responding to: Richard Erlacher's previous message
Non working serial port interfaces in software that fails with USB to Serial Converter cables is often not the fault of the USB serial device or it's OS drivers. Many old time programs written for use with the serial ports in a PC were written with direct access to the COM port I/O addresses and interrupt vectors. There are a slew of these old programs still in use even today and is one of the reasons that Microsoft in particular has mapped the COM port register addresses as still accessible from user program space!

Newer and more smartly written software that uses the OS API to open and access serial port devices, whether they be the old legacy COM1 to COM4 hardware supported devices, virtual COM ports mapped through to USB serial cables or virtual ports offered by drivers to devices such as Blue Tooth radios, GPS units or cell phone interfaces will stand a much better chance of working properly with non legacy hardware.

Michael Karas


List of 31 messages in thread
TopicAuthorDate
At89s52 programming and interfacing      Abhisek Singh      05/05/13 12:25      
   What development board?      Kai Klaas      05/06/13 05:09      
      link      Abhisek Singh      05/10/13 12:15      
         don't know any, but ....      Erik Malund      05/10/13 14:01      
   It is a well known fact ...      Erik Malund      05/06/13 09:01      
      Drivers      J. Guy      05/06/13 10:50      
      that's one of the penatlies for using USB.      Richard Erlacher      05/06/13 13:53      
         Caught up in......      Michael Karas      05/06/13 20:59      
      CP2102      Joseph Hebert      05/08/13 10:41      
         FTDI chip clock      Oliver Sedlacek      05/09/13 04:20      
            FTDI      Joseph Hebert      05/09/13 09:48      
               multi-port parts      Jim Granville      05/09/13 14:08      
         FTDI Combined Driver      Maarten Brock      05/10/13 09:01      
            FTDI      Joseph Hebert      05/10/13 11:42      
   USB advantages 100 penalties 2 ...      Erik Malund      05/06/13 14:17      
      Do those work with the various ATMEL "programmers"?      Richard Erlacher      05/08/13 08:23      
         Not Awways the USB Converter's Fault        Michael Karas      05/26/13 17:18      
            Absolutely!!      Andy Neil      05/27/13 04:22      
            I wouldn't argue with that for a minute      Richard Erlacher      05/27/13 10:57      
               Board version        Jim Granville      05/27/13 14:25      
                  The Board In Question      Andy Neil      05/27/13 17:46      
         RE: "an old PC that has a real serial port"      Andy Neil      05/27/13 04:26      
            Well .... actually ... no ...       Richard Erlacher      05/27/13 10:46      
               Old apps on Windows 7 (or 8)      Oliver Sedlacek      05/30/13 02:36      
                  don't know what "old apps" yo refer to, but ...      Erik Malund      05/30/13 07:21      
                     That's what I've said about Vista and Win7      Richard Erlacher      05/30/13 10:03      
                     OrCAD 9      Oliver Sedlacek      05/31/13 01:49      
                        It's a windows version, and much less capable than v 1.0      Richard Erlacher      05/31/13 08:33      
      RE: "decent USB equipment works very well"      Andy Neil      05/27/13 04:29      
         this goes to the heart of the issue ...       Richard Erlacher      05/29/13 11:42      
   Terminal emulator      D.C. Van Warendorp      05/25/13 08:42      

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