how do you access the NAS in those other systems?
install a program called smb4k and run it and see if the NAS will show up.
make sure everything is connected in a way that will allow you to access the NAS from pclinuxos and then open the terminal and run the following command and post its output
smbtree -N -d 2
OK ... maybe I have resolved! (at moment ...

)
I think it was a wrong path dolphin!
If I type the path directly: for example in my home network: smb :/ / 192.168.1.100 /
the hard disk is read correctly! A bit 'slow ... (max 8MiB / s) ... I think that is due to my router!
I apologize for my lack of knowledge about the samba protocol!
PS.
if I type:
smbtree -N -d 2
.......
WORKGROUP
Got a positive name query response from 192.168.1.100 ( 192.168.1.100 )
\\NETWORKSPACE2 NetworkSpace2
...........
At the moment, thank you very much for your help!
Ernst