Ink level determination using the ink command

Hi,
I have got ink running but am having difficulty in specifying the port that my
printer is connected to.

The printer is a HP Business Inkjet and it is connected to my RH9 box through
the USB interface.

Assuming that I run ink using the following guidelines:

ink -p <port> [-n <portnumber>]

What might the port number be, I assume "usb" for port and "lp1" as port
number.

This gives me an invalid port number error.
I also have a laserjet 4 attached to the Linux box by using a parralel
connection.


Cups views the printers as follows:

Laserjet: Device URI: parallel:/dev/lp0 
Business Inkjet:Device URI: usb://hp/business%20inkjet%201100?serial=

Can someone who has knoledge of this program please help!

Regards

John Lahr