Taskalpha 5500 not switching cassettes when out of paper

[A\ztech]

Hi Guys got an issue with a Taskalpha 5500 not switching cassettes when it runs out of paper, it has a PF-740 and I'm trying to get it to switch from tray 3 to tray 4 (or vice a versa) when one tray runs out. I've checked all the settings letter size, media type and it still wont switch any ideas? Thanks in advance

[blackcat4866]

Are you talking about Auto Tray Switching (for printing)? If yes, it has to turned on with a PreScribe command:

!R! FRPO R1,99;EXIT;

=^..^=