Epson 802.11g Reference Manual page 276

For the ink jet printer or all-in-one
The operation of the printer or all-in-one connected directly to the
computer as a shared printer is the same as that connected to the
wireless LAN.
Note:
The following explanation uses screen images of Windows XP. The
screen images are the same for Macintosh.
Cartridge information
When the printer or all-in-one is connected to the wireless LAN,
all information is displayed as "Unknown" even if you click the
Information button in the EPSON Status Monitor 3 dialog box.
Connected to the computer directly
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