Epson H6000IIP - TM Two-color Thermal Line User Manual page 149

Section 7. Warnings
7.1. Precautions for Connecting with USB I/F
When connecting a new device, turn on the device before running the "Add
New Device" wizard. The disconnected or power-off devices are not
recognized.
If the port number of the device is not indicated on the Port Connection View
screen during the connection, select the corresponding device on the Main
View, or select [Auto Setting] button on the "Communication Settings" dialog
box. The connected devices are recognized.
When the same type of devices are registered already and some of the
devices are turned off, there is a possibility that the turned off device's USB
port number is replaced with the new one. Therefore, beware of registering
multiple numbers of the same devices.
Please note the following points when re-assigning USB ports:
Turn on the applicable device when doing automatic USB port setting.
If using several devices of the same model on different USB ports, only
do automatic setting for one device.
Editing the registry during automatic USB port setting is not supported.
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User's Manual
Installer, SetupPOS, TMUSB
Version 2.65 Jul. 2009