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Epic 880
TM
Specifications and Requirements
Page 20 100-88002 Rev B
USB Interface
The USB interface supports USB Version 2.0 High speed or full speed. The standard
USB interface is implemented through a standard Series “B” receptacle as defined in
the USB Specification. The printer is self-powered and does not draw power from the
standard type B USB interface cable.
The Standard USB Type B connector has the following pin functions:
Pin Signal
1 Vbus (+5 V dc
1
) (This is used to select between Interfaces)
2 Minus data
3 Plus data
4 Ground
Note: The standard USB interface does not have enough power to run the printer. It
is not possible to power the printer with the USB cable alone.
USB Configuration
To allow the application to use a virtual serial port or a USB printer port to interact with
the printer, the EPIC 880
TM
supports both ports, and can be configured to support a
Virtual COM port or a USB Printer device. The USB section of the configuration
allows USB Mode, USB Enumeration, and whether the printer will perform a normal
Windows plug and play operation to be configured. The default is printer port, use
description, with Windows PnP on.
You should configure these options based on how you want the printer to perform in
your system. Typically only the Virtual COM or USB printer driver is required: to load
the Transact Virtual COM port driver, disable the USB printer port. Typically you can
use the description as the enumeration ID, representing how the printer is uniquely
identified to the host. If you select a description, all Epic 880’s will be the same, and
you can interchange printers without affecting the port location, subject to the
limitation that no more than one Epic 880 can be connected to the same host. If that
is a requirement, select ID by serial number or allow the ID number to be assigned by
windows based on the connection.
You can also disable the Windows PnP sequence. This will prevent the Windows
system from receiving the printer driver selection sequence. This will allow you to
manually assign a driver to the USB printer connection and not have Windows keep
asking for a printer driver.
The adapter will support a high speed USB interface if the host also supports high
speed. If the host does not support high speed the printer will revert to full speed. It
is possible to disable high speed operation by setting a configuration option. The
printer does not support the USB low speed protocol.
1
The Vbus signal is used to disable the serial port. If the USB is connected the RS232 serial
port is not active.