It does support USB printers (we have a client with an HP Colour Laser attached) although I think it only supports USB1.1 and USB2.0.
@weefoong.
There are two things you can look at.
1) is the USB light at the front of the unit lit when the printer is plugged in and powered on?
2) when you log in via the webUI and go to 'Management' --> 'System Management' --> 'USB Devices' (at the left of the screen) what do you see in the Printer Information section when the printer is plugged in and powered on?
As far as I can remember the USB light on the unit should be off if a printer is attached and the printer name should appear in the printer information ('no USB printer detected' will appear if the printer is switched off).
Another thing, have you given the DNS-320L a fixed IP address? We have found doing so is better when using the print server.
Thanks for the reply FurryNutz & Ivan.
1. the USB light at the front of the unit did not light up after i plug in my printer, but since i tried print with this status, the printer did not print out anything. After that i tried restart the NAS, the USB light turn to orange light with the printer connected to NAS during the restart
2. in the webUI, i can't see the printer information after i plug in my printer. After i restart NAS with printer connected (orange light on USB shown), the USB storage showing the printer manufacture brand & model, but the printer information shows nothing
i'm using NAS with fixed ip 192.168.0.30
Really appreciate for the help provide, wish i could find a solution with your guys input