Epson TM-L90 Developer's Manual page 128

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3. Connect the USB cable from the host computer to the USB upstream connector.
4. For models that have the UB-U01 installed, a maximum of two USB devices can be
connected to the USB downstream connector.
Note:
The UB-U101 serves as a bus power-supply hub. Therefore, it is important to note that bus power
supply hubs (including the UB-U01) and bus power supply functions with power dissipation of 100
mA or more cannot be connected directly to the printer.
(A UB-U02 can be directly connected to a UB-U01 hub.)
5. Install the UB-U01/02 device driver on the host computer.
Note:
For information on how to obtain the required device drivers and their installation procedures, contact
the nearest Epson service center.
Ethernet Interface Models
Names of parts
The names of the various parts of the Ethernet interface are shown below.
10 BASE-T Ethernet LED (green)
interface
Take care not to
connector
press LEDs by
mistake.
Connecting interface cables
CAUTION:
Connecting devices directly to LAN cables that are installed outdoors will expose
them to damage from power surges caused by lightning and other inductive
sources. It is best to make sure that devices without proper surge protection are
cushioned by being connected through devices that do have surge protection.
Otherwise, it is better not to connect them to outdoors lines.
Rev. A
LED (red) Switch
Pressing the power-supply
switch for too long when
power is on will reset the
system to its factory
defaults.
Name of Parts
TM-L90 Developer's Guide
Connection of Cable and Option D-3