Re: Serial Port Emulation

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.arch.embedded
Subject	Re: Serial Port Emulation
Date	2019-02-28 08:41 +0100
Organization	A noiseless patient Spider
Message-ID	<q583bd$mas$1@dont-email.me> (permalink)
References	(6 earlier) <q4ec37$k6m$1@dont-email.me> <slrn3uboq6oaj4.r5h.andrews@sdf.lonestar.org> <q4sbal$sre$1@dont-email.me> <v3i37e57qvoghiqp27ki59vb0dj5g0hm16@4ax.com> <q57n0n$n4$1@dont-email.me>

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On 28/02/2019 05:15, Les Cargill wrote:
> Robert Wessel wrote:
>> On Sat, 23 Feb 2019 14:48:40 -0600, Les Cargill
>> <lcargill99@comcast.com> wrote:
>>
>>> Andrew Smallshaw wrote:
>>>> On 2019-02-18, David Brown <david.brown@hesbynett.no> wrote:
>>>>>
>>>>> RS-232 is short distance too (though a bit longer than TTL) - for long
>>>>> distances you use RS-485 or RS-422.  RS-232 is a legacy standard -
>>>>> there
>>>>> is plenty of old stuff the still has it, but it would be a strange
>>>>> choice for anything new.
>>>>
>>>> I'm genuinely interested to hear people thoughts on this.  Personally
>>>> if I anticipate a true long life interfacing requirement - 20, 30,
>>>> 40 years - RS232 is my preferred option, ideally (if appropriate
>>>> to the use case) with a command line on it.
>>> <snip>
>>>>
>>>> I don't pretend to have answers in the general case, just interested
>>>> in what peoples thoughts are.
>>>>
>>>
>>> Anything you can do with RS323 you can do with Ethernet. There are
>>> pathological size/weight/power cases where Ethernet doesn't fit but
>>> if it does...
>>
>>
>> Ethernet does have a couple of annoying configuration issues, and
>> requires either a custom client on an attached PC, or requires enough
>> software to implement TCP and a TELNET or HTTP server (and TCP/IP
>> brings a couple of annoying configuration issues as well).
>>
> 
> There exist things like RasPi boards which can have FTDI USB
> RS232 ports attached. So really? You should be able to use DynDNS and
> DHCP and that's about all the config you need. With the RasPi's I have
> seen, it's even 802.11 - just carry an AP and you're in.
> 
> You can do all the fiddly bits once, and offsite.
> 
> Generally, I'll have a custom TCP server running on the Pi, which
> provides the option of encoding any twiddly parts about the device on
> the other end of the FTDI device, within the Pi.

I don't know what kind of systems you work with, but to me a Pi is
convenient for testing and developing, but is out of the question for
most delivered systems.  The same goes for jumbled mixups with dynamic
DNS - fine for test setups, not for deployment.

> 
>> And, of course, as soon as you do have an Ethernet connection,
>> anything non-TCP/IP is ruled out because the customer and marketing
>> will immediately want to be able to do (whatever) from across the
>> campus, and then inevitably further than that.  And then you have
>> security issues.
>>
> 
> Almost everything has Ethernet now.

Almost every microcontroller does /not/ have Ethernet.  Almost every
electronics board made does /not/ have Ethernet.

> 
>> Definitely the way to go if you can, but there are enough hurdles that
>> you can find yourself longing for async RS-232 and a terminal
>> emulator.
>>
> 
> Oh, not so much :) Well, sometimes :)
>

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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