Re: Serial Port Emulation

From	Tauno Voipio <tauno.voipio@notused.fi.invalid>
Newsgroups	comp.arch.embedded
Subject	Re: Serial Port Emulation
Date	2019-02-18 10:38 +0200
Organization	A noiseless patient Spider
Message-ID	<q4dqtm$rdq$1@dont-email.me> (permalink)
References	<64bd4f22-3417-4a6d-bb59-d066487a7126@googlegroups.com> <q4c3jh$lgi$1@dont-email.me> <q4cfev$7j4$1@dont-email.me>

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On 17.2.19 22:16, David Brown wrote:
> On 17/02/2019 17:54, Tauno Voipio wrote:
>> On 17.2.19 12:08, gnuarm.deletethisbit@gmail.com wrote:
>>> I'm working to improve a test program for the hardware I use to test 
>>> some boards I make.  These boards are tested using a test fixture 
>>> controlled over an RS-232 port from the PC.  So I don't need to lug 
>>> hardware around with me I emulate the test fixture on the same PC I 
>>> run the test program.  I need comm port emulation software that will 
>>> emulate a bridge between two serial ports to connect the test program 
>>> and the test fixture emulator.
>>>
>>> One I've been using is called, oddly enough, "Free Virtual Serial 
>>> Ports".  It is free to use, but only in a limited configuration which 
>>> will do the job, but just barely.  I have also noticed that if my 
>>> programs are not closed properly (or some other cause) this bridge 
>>> software will hang one of the ports.
>>>
>>> I don't want to emulate the serial port connection in my test fixture 
>>> emulator because if I take the program down a lot while testing, I 
>>> will have to continually restart both the test program and the 
>>> emulator program.  There are a few initialization steps that become 
>>> tedious after doing them a few dozen times.
>>>
>>> Is there a serial port bridge program that works well and is not 
>>> expensive?
>>>
>>> Rick C.
>>>
>>
>> Get a USB serial port adapter and a null modem cable,
>> so the test program does see any difference.
>>
> 
> "Null modem cable" ?  He doesn't need RS-232 converters and 9-pin DSUBs 
> here.  A couple of USB to TTL Uart cables is what he needs, with the 
> wires tied together.
> 
> <https://www.ftdichip.com/Products/Cables/USBTTLSerial.htm>
> 
>> The virtual serial ports are probably more part of the
>> problem set than part of the solution set.
>>


Most of the off-the-shelf USB serial dongles have the 9 pin connectors
with RS-232 DTE signals, which do need null modem to connect together.

-- 

-TV

Thread

Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-02-17 02:08 -0800
  Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-17 13:42 +0100
    Re: Serial Port Emulation Chris <xxx.syseng.yyy@gfsys.co.uk> - 2019-02-17 15:49 +0000
  Re: Serial Port Emulation Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2019-02-17 18:54 +0200
    Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-17 21:16 +0100
      Re: Serial Port Emulation Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2019-02-18 10:38 +0200
        Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-18 10:49 +0100
          Re: Serial Port Emulation Richard Damon <Richard@Damon-Family.org> - 2019-02-18 07:25 -0500
            Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-18 14:31 +0100
              Re: Serial Port Emulation Andrew Smallshaw <andrews@sdf.org> - 2019-02-19 16:10 +0000
                Re: Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-02-19 09:12 -0800
                Re: Serial Port Emulation upsidedown@downunder.com - 2019-02-19 19:58 +0200
                Re: Serial Port Emulation Grant Edwards <invalid@invalid.invalid> - 2019-02-19 18:22 +0000
                Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-19 22:50 +0100
                Re: Serial Port Emulation Grant Edwards <invalid@invalid.invalid> - 2019-02-19 22:23 +0000
                Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-20 08:53 +0100
                Re: Serial Port Emulation upsidedown@downunder.com - 2019-02-20 10:17 +0200
                Re: Serial Port Emulation Theo <theom+news@chiark.greenend.org.uk> - 2019-02-19 22:35 +0000
                Re: Serial Port Emulation upsidedown@downunder.com - 2019-02-20 01:36 +0200
                Re: Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-02-19 19:40 -0800
                Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-20 09:00 +0100
                Re: Serial Port Emulation upsidedown@downunder.com - 2019-02-19 19:16 +0200
                Re: Serial Port Emulation Theo <theom+news@chiark.greenend.org.uk> - 2019-02-19 22:28 +0000
                Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-20 10:32 +0100
                Re: Serial Port Emulation Robert Wessel <robertwessel2@yahoo.com> - 2019-02-19 18:44 -0600
                Re: Serial Port Emulation Les Cargill <lcargill99@comcast.com> - 2019-02-23 14:48 -0600
                Re: Serial Port Emulation Robert Wessel <robertwessel2@yahoo.com> - 2019-02-23 16:34 -0600
                Re: Serial Port Emulation Les Cargill <lcargill99@comcast.com> - 2019-02-27 22:15 -0600
                Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-02-28 08:41 +0100
                Re: Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-02-28 15:07 -0800
                Re: Serial Port Emulation David Brown <david.brown@hesbynett.no> - 2019-03-01 10:04 +0100
                Re: Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-03-01 13:09 -0800
                Re: Serial Port Emulation Les Cargill <lcargill99@comcast.com> - 2019-03-04 17:58 -0600
                Re: Serial Port Emulation Paul Rubin <no.email@nospam.invalid> - 2019-03-01 02:25 -0800
                Re: Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-03-01 13:16 -0800
                Re: Serial Port Emulation Paul Rubin <no.email@nospam.invalid> - 2019-03-01 16:45 -0800
                Re: Serial Port Emulation Les Cargill <lcargill99@comcast.com> - 2019-03-04 17:44 -0600
                Re: Serial Port Emulation Richard Damon <Richard@Damon-Family.org> - 2019-02-23 19:37 -0500
                Re: Serial Port Emulation Les Cargill <lcargill99@comcast.com> - 2019-02-27 22:17 -0600
          Re: Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-02-18 06:28 -0800
          Re: Serial Port Emulation Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-02-18 22:33 +0100
  Re: Serial Port Emulation "A.P.Richelieu" <aprichelieu@gmail.com> - 2019-02-17 21:06 +0100
  Re: Serial Port Emulation raimond.dragomir@gmail.com - 2019-02-17 21:56 -0800
    Re: Serial Port Emulation gnuarm.deletethisbit@gmail.com - 2019-02-17 22:37 -0800
  Re: Serial Port Emulation "Mat Nieuwenhoven" <mnieuw@zap.a2000.nl> - 2019-02-18 12:34 +0100

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