Pb Xsane: error at device opening(Brother DCP-750CW ),


I can use my 3 in 1 Brother DCP-750CW as a network printer (hardwired) but when I want to use it as a scanner and after launching xsane with the KDE menu I get the following message:
Error at device opening ‘brother2:net1;dev0’:invalid argument.
Hereafter is a summary of what I exactly did:

1-Installation of sane et xsane with yast2: at first glance OK

As superuser:
2-Installation of Brother’s brscan2 (brscan2-0.2.4-0.x86_64.rpm) OK

3-Command: brsaneconfig2 -a name=Brother_Scanner model=DCP-750CW nodename=BRN_C36ACF

4- Answer to brsaneconfig2 -q: OK
(Devices on network
0 Brother_Scanner “DCP-750CW” N:BRN_C36ACF)

5-With Yast scanner configuration: following answer:

Pilote ^Scanneur
dev0, Brother, DCP-750CW Brother DCP-750CW sur dev0
brother2 sur

Thank you for help.