Re: Trouble shoot Dumb terminals?

THank you all for your relies. I have found out now, that they are looking
to remove the DT's and replace w/ PC's so they issue will disappear.
Steve
> You most fortunate ... our pattern is the reverse ... a PC user might have
> more junk on their PC than is supported by the "gas" the company has
> supplied them ... such as emoticons in e-mail, lots of applications open
> concurrently, so the PC locks up, and has to be rebooted, while one of the
> sessions was in middle of some 400 update job.
>
> However, check the addresses of the dumb terminals, and the connections
> ...
> they should all be unique.
> * We had a problem with an old terminal that tended to lose its electronic
> setup, so it thought it was logical address 0 or 1 (whatever is first)
> that
> was assigned to some other dumb terminal, so now two talking to 400 with
> same address.  Both powered up, they interfere with each other ... one
> powered off, the other works find.
> * Check the manual for the dumb terminals with problems, and what kind of
> a
> twinax connection is being used ... there are several kinds and they not
> interchangeable ... we had a problem once with a dumb terminal with the
> wrong kind of connector ... that worked fine, but other terminals on same
> daisy chain got messed up because of it.
> * The last terminal on the cable thru should be properly terminated.  If
> the last guy gets removed, that means the cable to where the last guy used
> to be located, is a humongous antenna to cause interference to others
> downstream.
> * The cable can be spliced, where terminals used to be, but each line has
> a
> ceiling on total number of splices, and length of the cable.
> * Check your configuration ... there is a limit to how many addresses can
> be connected to a remote controller & those no longer in use can eat up
> the
> available total ... you may need to delete some old ones to support new
> ones.
> * Check around the work area ... we have had clutter at wall plug such
> that
> someone accidentally kicks a desk or whatever, and it jiggles the wall
> plug.
> * Check other stuff on same electrical circuit as the dumb terminal (this
> also applies to PCs.  A refrigerator or other appliance can suddenly draw
> more power, causing a loss of voltage to sensitive equipment on the same
> circuit.
> * Check the path taken by the twinax cable ... do you have an occasional
> cable city, with signal cables, power cables, twisted together ... best
> way
> to cross is at right angles ... power cable alongside signal cable can
> cause interference.  Other things can cause interference.  Some place
> there
> is IBM manual that talks about appropriate distances ... there's some
> safety margin there ... our AS/400 is next door to Airport Radar, which is
> clear violation of IBM rules.
> * Does the program have a screen that calls for 132 wide compressed
> screen,
> while the dumb terminal is either not setup for that, or not capable of
> that?
> * When the program "shuts down" is there something in the error log on
> that
> work session that provides a clue, such as an associated error message?
> * Is there anything in WRKPRB on these dumb terminals?
>
>>HI We have an issue in a remote plant. Some of the users have dumb
>>terminals and others have PC client access. Sometimes, the Dumb terminals
>>will shut down in the middle of a program. But this never happens w/ the
>>PC C/A.
>>
>>I was interested in troublshooting this issue. Could it be the program,
>> or
>>is it communications, and how to figure out the root causes?
>>
>>Thanks,
>>Steve
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