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тАО09-24-2010 02:28 AM
тАО09-24-2010 02:28 AM
Problem on a DS20: baud rate of TTA0 changing without reason
We use the serial line tta0 at 600 bps.
Sometimes, we notice that the serial line speed returned to 9600 bps.
We use the same application on 8 DS20, but we notice the problem only on 3-4 servers.
Any idea?
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тАО09-24-2010 02:41 AM
тАО09-24-2010 02:41 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
> speed returned to 9600 bps.
Notice how, exactly?
show terminal tta0
Isn't 9600 normal if it's idle and set to
Autobaud?
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тАО09-24-2010 02:54 AM
тАО09-24-2010 02:54 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
The port is allocated permanently by the application.
The port is not in autobaud.
Before reading on the port, we read the speed via a qio.
I know that we can reset the speed to 600 bps at this moment, but it's only a workaround masking the problem.
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тАО09-24-2010 04:42 AM
тАО09-24-2010 04:42 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
Are there applications which set port speed to 9600 on the same system?
Purely Personal Opinion
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тАО09-24-2010 05:13 AM
тАО09-24-2010 05:13 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
I don't have the problem on the DS20E.
Patches level is the same on all the servers.
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тАО09-24-2010 09:40 AM
тАО09-24-2010 09:40 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
> Sep 24, 2010 12:42:31 GMT 0 pts
If you didn't want any help, then why ask?
> Application allocates the port at startup
> and set the baud rate to 600 bps.
At system start-up or at application
start-up? Sets the speed how, exactly?
> The port is allocated permanently by the
> application.
What, exactly, does that mean?
> The port is not in autobaud.
> show terminal tta0
Some people might find actual output from an
actual command to be more credible than your
opinion.
> Before reading on the port, we read the
> speed via a qio.
Read how, exactly? IO$_SENSECHAR?
IO$_SENSEMODE?
> At 2 am (example, it's not always at the
> same hour), I don't think that a user try
> to change the speed on these computers.
"I don't think" is hardly evidence of
anything, let alone proof. Have you no batch
queues? I don't think that a change like
this is happening spontaneously, either.
> I don't have the problem on the DS20E.
Then it should be easy to find the difference
between the two systems, right? With
approximately no useful information to work
with, I doubt that any non-psychic here will
be able to find that difference.
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тАО09-26-2010 02:28 PM
тАО09-26-2010 02:28 PM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
I also have to ask... why 600baud? That's a seriously dark ages speed. Maybe a character printer? LA36 teletype perhaps?
Maybe it's time to consider moving to at least 2 decades ago and upgrade to a console manager?
I'd put an Audit ACE on the terminal device, look for successful updates.
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тАО09-27-2010 01:39 AM
тАО09-27-2010 01:39 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
$ SET TERMINAL TTA0:/PERMANENT/NOBROADCAST/NOTYPEAHEAD/NOTTSYNC/NOWRAP -
/SPEED=(600)/DEVICE_TYPE=UNKNOWN/NOECHO/PASTHRU/EIGHTBIT/PARITY:EVEN
--------------
$ sh term tta0
Terminal: _TTA0: Device_Type: Unknown Owner: NOE_SC2_CNF
Username: NOEMGR
Input: 600 LFfill: 0 Width: 80 Parity: Even
Output: 600 CRfill: 0 Page: 24 Terminate on parity errors
Terminal Characteristics:
Interactive No Echo No Typeahead No Escape
No Hostsync No TTsync Lowercase No Tab
No Wrap Scope No Remote Eightbit
No Broadcast No Readsync No Form Fulldup
No Modem No Local_echo No Autobaud No Hangup
No Brdcstmbx No DMA No Altypeahd Set_speed
No Commsync No Line Editing Overstrike editing No Fallback
No Dialup No Secure server No Disconnect Pasthru
No Syspassword No SIXEL Graphics No Soft Characters No Printer Port
Numeric Keypad No ANSI_CRT No Regis No Block_mode
No Advanced_video No Edit_mode No DEC_CRT No DEC_CRT2
No DEC_CRT3 No DEC_CRT4 No DEC_CRT5 No Ansi_Color
VMS Style Input
--------------
It's an old device accessed every second (read/write).
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тАО09-27-2010 06:02 AM
тАО09-27-2010 06:02 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
And what does it look like when the speed has
changed (without reason)?
> [...] /PERMANENT [...]
In my experience, SET TERMINAL /PERMANENT is
pretty durable. Until someone changes it.
> I'd put an Audit ACE on the terminal
> device [...]
Makes sense.
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тАО09-27-2010 06:16 AM
тАО09-27-2010 06:16 AM
Re: Problem on a DS20: baud rate of TTA0 changing without reason
>> Sep 24, 2010 10:41:19 GMT 0 pts
>> Sep 24, 2010 12:42:31 GMT 0 pts
>If you didn't want any help, then why ask?
Hanlon's Razor. "Never attribute to malice that which is adequately explained by stupidity."
This is hist first question here!
Philippe might not know how to properly assign points.
Just like he did not know to provide pertinent information directly with the question.
Philippe... Just 'yanking your chain' as the Americans say. Not calling you stupid. You are doing just fine.
Wish I could help for real, but me thinks that the others are already helping you by asking the right questions to help you focus on a root cause search.
Good luck!
Hein