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Re: How to snif full-duplex UART protocol between two nodes

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.arch.embedded
Subject Re: How to snif full-duplex UART protocol between two nodes
Date 2023-02-21 16:55 -0800
Organization A noiseless patient Spider
Message-ID <87pma2tt6q.fsf@nightsong.com> (permalink)
References <tsvh99$mpm3$1@dont-email.me> <87y1ost36d.fsf@nightsong.com> <a636468a-8d69-488b-bb38-cfe1c7f67239n@googlegroups.com>

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Rick C <gnuarm.deletethisbit@gmail.com> writes:
> Since this involves two devices communicating and two serial ports,
> one to monitor the data in each direction, wouldn't this be an X
> cable?  Or am I missing something?

I guess you could call it an X cable.  This has a diagram that looks
about right:

https://www.lammertbies.nl/comm/cable/rs-232-spy-monitor#full

I've never made one of these myself.  I used one that a co-worker made,
and wrote the code to log the data.  I said 1200 bps earlier, but I
think it was actually 9600 bps.  The connected devices were a POS
terminal and a receipt printer.

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Thread

How to snif full-duplex UART protocol between two nodes pozz <pozzugno@gmail.com> - 2023-02-20 11:16 +0100
  Re: How to snif full-duplex UART protocol between two nodes Don Y <blockedofcourse@foo.invalid> - 2023-02-20 04:17 -0700
  Re: How to snif full-duplex UART protocol between two nodes Theo <theom+news@chiark.greenend.org.uk> - 2023-02-20 12:23 +0000
  Re: How to snif full-duplex UART protocol between two nodes Richard Damon <Richard@Damon-Family.org> - 2023-02-20 07:59 -0500
  Re: How to snif full-duplex UART protocol between two nodes Paul Rubin <no.email@nospam.invalid> - 2023-02-20 13:52 -0800
    Re: How to snif full-duplex UART protocol between two nodes pozz <pozzugno@gmail.com> - 2023-02-21 10:59 +0100
      Re: How to snif full-duplex UART protocol between two nodes Don Y <blockedofcourse@foo.invalid> - 2023-02-21 04:11 -0700
        Re: How to snif full-duplex UART protocol between two nodes Theo <theom+news@chiark.greenend.org.uk> - 2023-02-22 11:33 +0000
          Re: How to snif full-duplex UART protocol between two nodes Don Y <blockedofcourse@foo.invalid> - 2023-02-22 05:08 -0700
    Re: How to snif full-duplex UART protocol between two nodes Rick C <gnuarm.deletethisbit@gmail.com> - 2023-02-21 14:05 -0800
      Re: How to snif full-duplex UART protocol between two nodes Paul Rubin <no.email@nospam.invalid> - 2023-02-21 16:55 -0800
        Re: How to snif full-duplex UART protocol between two nodes Brian Cockburn <brian.cockburn.1959@gmail.com> - 2023-04-22 07:03 -0700
  Re: How to snif full-duplex UART protocol between two nodes Grant Edwards <invalid@invalid.invalid> - 2023-02-20 22:18 +0000
  Re: How to snif full-duplex UART protocol between two nodes Clifford Heath <no.spam@please.net> - 2023-02-21 09:58 +1100
  Re: How to snif full-duplex UART protocol between two nodes Andrew Smallshaw <andrews@sdf.org> - 2023-02-21 07:05 +0000
  Re: How to snif full-duplex UART protocol between two nodes Andrew Smallshaw <andrews@sdf.org> - 2023-02-21 07:07 +0000

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