Powered USB connectors
The powered USB connectors provide additional power from the host to devices
that require more power than is available from the USB standard Type A connector.
As shown in Figure 13, additional power is supplied through another set of contacts
that are contained within the powered USB connector.
The powered USB receptacle consists of two connectors that are integrated within a
common shielded housing. These two connectors are stacked vertically inside the
common housing. The upper connector contains four contacts that are used for
powering the attached device. The lower connector is a fully compliant USB Type A
connector capable of mating with either a standard USB Type A plug or a powered
USB plug. In other words, the bottom half of the connectors are standard USB Type
A ports to which USB I/O devices can be attached.
Powered USB connectors provide the following features:
v Additional power for USB POS I/O devices needing more than 5 V.
v Unique keying and color coding of the 12-V and 24-V connectors, which prevents
unintentionally attaching a connector to the wrong type of port.
v Positive mechanical retention latch between the plug and receptacle to prevent
inadvertent disconnections.
Non-POS I/O devices
The SurePOS Models 721/741/781 and 722/742/782 support most of the following
non-POS I/O devices:
v Many, but not all, USB mass-storage devices such as diskette drives, CD-ROM,
and memory key. Lack of standardization precludes a list of the devices that are
not supported. Boot mode is supported for most devices that support USB boot.
v IBM VGA monitors (CRT and LCD)
v Industry-standard PC keyboards, mice, and printers
v Standard USB and RS-232 devices with appropriate drivers, software, and
operating systems
A
B
Figure 13. Example of the powered USB port. A is the power section of the connector and
B is the standard USB section of connector.
Updated October 31, 2007
20 SurePOS 700 Series: SurePOS 700-721/741/781, 722/742/782 Planning, Installation, and Operation Guide
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