Re: 5250 & 3270 together?

[wsuetholz@xxxxxxxxxxxxxx]

Hello,
  I don't know if it is an implementation issue or not,  I have seen
this kind of behavior with CISCO terminal servers, as well as others.
I also don't know if the same thing happens with tn3270e protocol, when
the LU you are requesting isn't available.  Since I haven't implemented
that yet.

  My tn3270 implementation does not currently process ASCII messages,
esp. since I wait for certain negotiations to be done before I will accept
any messages, and this message occurs before all the parameters are
set..  Because my situation is for a voice response platform, there isn't
a person setting at the screen, it's all for screen scraping.  And, because
of that, I have to delay enough at open time, so the program doesn't think
that it has a blank screen to start out with, and tries to send data to
the host before all the telnet negotiations have been done.

  Anyhow, a tn3270 implementation has to allow for ASCII data to be displayed
before it get's any 3270 datastream, and (I think) during the processing
there is a way to switch back to ASCII mode.  Historically there were ASCII
menu systems in front of the hosts that you would access with the 3270 emulator
and then switch over to 3270 mode for talking to the host.  Anyways, thats what
I recall.  Never having had to use that type of connection I could be 
mistaken :-)


Bill Suetholz

On 30-May-00 Mike Madore wrote:
> Hi,
> 
> On Tue, 30 May 2000 wsuetholz@centonline.com wrote:
> 
>> future to have async terminal emulations added in later.  Some of that
>> async emulation needs to be there for TN3270, because if you try to access
>> a terminal server that doesn't have any sessions available in it's pool
>> of dynamic LU's, then you will get an ASCII message to that effect, not
>> a tn3270 datastream message.  
> 
> Is this just an implementation decision?  I can easily send a 3270 or 5250
> datastream message to the client if there is a resource shortage.
> 
> Mike
> 
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