OK, I've installed the printer in my system and also downloaded necessary plugins. But in HP Device Manager, the status is "Device communication error", the code number is 5012.

Then I tried hp-check in console. Here is the output:

Of course the printer should be fine, because I can use it in my Windows XP.

I have the same printer working fine with Slackware 13. Try configuring directly from cups. Here is my printer.conf file.

Thanks tux_dude.

But the problem is still. I deleted my printer in hplip, and installed again in my cups. When I tried to print a test page, it said device communication error again.

For Slackware 13, you shouldn't have to install anything: your hplip version should be new enough. Go to the HPLIP site and check for your printer: they'll tell you the minimum version of hplip you need.

Just to check, do you have rc.cups set to run (chmod +x)?

Did you add your user to the lp group?

One more thing: do you have your firewall setup with iptables (/etc/rc.d/rc.firewall)? If so, there are several ports you have to open besides 515 and 631; see the manual for more info. I just set a rule to explicitly allow all traffic from my computer to the printer.

I got my HP Officejet working with these instructions: http://hplipopensource.com/hplip-web.../cups/net.html. Hopefully they'll work for you.

Thanks Vik.
I tried to use hp-makeuri to generate my printer's uri. But failed.

HP Linux Imaging and Printing System (ver. 3.9.4b)
Device URI Creation Utility ver. 5.0

Copyright (c) 2001-9 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

error: Device not found

I'm pretty sure the ip is currect and my printer is powered on, because I can ping this ip. So what's wrong with it?

you should be able to do:
hp-makeuri x.x.x.x

If it doesn't find the printer on the network, then it won't work right. If you type in the printer's IP in a browser, does the status screen come up? If not, check your network settings on the printer. On my officejet, I can program the default router, netmask, IP, wpa key, etc using the printer buttons. Does your printer also have this feature?

Another question: assuming that's all setup fine, is there another device on your network trying to use the same IP? Something to watch out for is setting up your router as a dhcp server and not reserving IPs below a certain range for static IPs. On my network I have the router only give out DHCP addresses above 10. Hope this helps.

If you're still having trouble, try setting it up in windows. If you can get it setup correctly in Windows, you shouldn't have any trouble setting it up in Linux.

To Vik:

I can see the status screen in my web browser. And I'm pretty sure there is no IP address conflict. I can also use my printer in my windows.
So what's the problem??? I really want to use my printer in my slackware...

Good!!! I figured it out!
The problem is that I've disable the support for SNMP.
When I enabled it, everything seems to be fine...
Thanks Vik, and everyone offer your help!

Just to clarify: you enabled SNMP through the firewall and that fixed it?

I think rangertang is referring to the net-snmp package.

I had this same problem with my setup initially but it was so long ago I forgot about the snmp package. Hplip installs and runs ok (for the most part) without this package, however it will not connect to any network printer. Installing the package solves the problem.

Thanks, good to know. I guess I never had problems with it because I do the full slackware install.