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<== Date ==> <== Thread ==>
Subject: Re: Ethernet-to-RS232
From: Eric Norum <[email protected]>
To: Maren Purves <[email protected]>
Cc: EPICS Techtalk <[email protected]>
Date: Wed, 9 Jul 2008 14:53:05 -0500
We have an 'iocConsole' script which ssh's to a common machine as a common user (controlled by ssh public keys) and connects to a screen session if it is active and otherwise starts a screen session. The screen session multiplexes access to the single serial line. This deals with most of your concerns, I believe.

1) We can control access without having to deal with IT administrators (other than setting up the common user account to begin with) -- just add a public key to the common user account.
2) Multiple users can access a serial line session at the same time.
3) Persistent scrollback, even if no users are currently attached.


On Jul 9, 2008, at 2:26 PM, Maren Purves wrote:

Reading up on that, I'm not sure that's what we'd be after, because,
wouldn't it require to know what machine the other person is logged
into the serial device from, and being able (privilege-wise) to
attach to that process?

Consider the following: a serial console of an IOC throws errors
and people in different locations (e.g. at their homes at night)
work on trouble shooting. While you can copy, paste and email
that, it's rather roundabout.

KVM switch was something that came to mind, but I don't quite
know how to interface those as the ones we have are either PS2
or USB. - A lot of the time even a web interface would be quite
sufficient. -

Aloha,
Maren
UKIRT

Matthieu Bec wrote:
'screen' is a neat gnu alternative for devices that do not support multiplexing/logging etc.
Rod Nussbaumer wrote:
Do any of the devices you folks are using allow multiple concurrent IP (ssh/telnet/whatever...) connections to a single RS-232 port? This would seem to be useful to allow monitoring of the vxWorks shell on the likes of VME or other headless CPUs.

Rod Nussbaumer
ISAC Controls, TRIUMF
Vancouver, Canada.



--
Eric Norum <[email protected]>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793


Replies:
Re: Ethernet-to-RS232 Rod Nussbaumer
References:
Ethernet-to-RS232 Dave Reid
Re: Ethernet-to-RS232 Mauro Giacchini
RE: Ethernet-to-RS232 Rees, NP (Nick)
Re: Ethernet-to-RS232 David Kline
Re: Ethernet-to-RS232 Rod Nussbaumer
Re: Ethernet-to-RS232 Matthieu Bec
Re: Ethernet-to-RS232 Maren Purves
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