The article describes the optimal settings for RISO printers and copiers.
For duplex capabiltiy on RISO please ensure you have the latest client installed.
https://coreza.com/admin/knowledge/downloads
Coreza Print admin console settings:
Under 'Edit printer'
1) Change to IPP e.g. ipp://10.10.10.10:631/ipp/print
2) Change printer driver to PDF as Octet Stream.
3) Ensure that Include PJL header is checked (enabled).
4) Ensure that 'Do not query the printer before printing (checked = do not query)' is checked (enabled).
5) Under advanced options (bottom of the same screen):
a) Check (enable) use multi-device copy
b) Select long edge & short edge if the printer supports it.
c) Leave back-sheet treatment to autodetect.
d) Choose color override mode according to printer capability
e) Select default paper size
Save your changes by hitting the 'Update button'
Run a test print