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
Summary of Contents for 4800-741
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