Yes, that was the initial configuration.
If this is correct then you can recreate the LUN from the CLI. To start the CLI open a terminal and enter promiseutil. The prompt will change to cliib>. The drives need to be in the same sequence as they originally were, if the drives have been removed and shuffled this wll not work.
The commands are as follows.
phydrv -a mod -s "config=unconfig" -p 1
phydrv -a mod -s "config=unconfig" -p 2
phydrv -a mod -s "config=unconfig" -p 3
phydrv -a mod -s "config=unconfig" -p 4
array -a add -p 1,2,3,4 -l "raid=5, forcesynchronized=yes"
The first 4 commands clear the passthru state. The last command creates the array+LUN.
If this is not the correct configuration you will see an unformatted disk in disk utility. If that's the case then you should delete the LUN immediately with the following CLI command.
array -a del -d 0
If that does not work, would it be possible to get the data off the drives with a recovery software?
No, the data is striped across all the drives, the RAID needs to be recreated. There are many data recovery services that can do this kind of work.