Yes, you can use the tnz zti emulator without SSL.
The following will force port 23 (the normal non-SSL tn3270 port) and zti will
default to not use SSL:
zti {hostname}:23
You can also turn it off for any port:
zti
set SESSION_SSL 0
goto {hostname}[:{port}]
Create a ~/.ztirc file with the following to always turn it off:
set SESSION_SSL 0
This is a very common question and needs to be documented better.
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