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Hello, i am a new developer on the IBM I platform, and i was asked to look into 5250 protocol to be able to fix some issues that we have on our solution. The problem is, i did not find anything for now to help me understand how it works.

So if anyone can enlighten me on how 5250 protocol works, or if you have any detailed documentation with all the specifications it would be awesome Or maybe am i searching for a knowledge long gone in the abyss of the web.

Thank you in advance and good day to you

To help you "fix" it we'd need to know what method is currently being used.

The normal method of handling 5250s is via display files (DSPG objects)

Or are you using UIM ?

or the C-style DSM APIs?

Or raw 5250 data stream?

Or ... ????

What language are you using? What issues are you facing etc.

I'm afraid the question you have asked is a bit like saying "My car doesn't work - what's wrong with it".

For all of the methods listed there are multiple related documentation options.

Thank you for your answer, sorry about the lack of clarity in my initial question.

I would like to know more about raw and extended 5250 data stream because our RPGLE program (based on telnet protocol) read the stream and we would like to be able to debug the issues we are facing sometimes.

Thank you for your time.

The best reference I've found for the 5250 protocol is the 5494 Functions Reference Manual from IBM. See if you can get a copy of that.

OK, i have found the SC30-3533-02-5494 Remote Control Unit Functions Reference Release 2.0 and SC30-3533-04-5494 Remote Control Unit Functions Reference Release 3.1, i will check what i can get from those.

Thank you