IBM 4820, Справочное руководство системы

Страница: 78 / 124

Video interface
The 4820 SurePoint Solution model 4WT, 4GT provides an analog interface.
POS input/output (I/O)
The 4820 SurePoint Solution provides the following Point-of-Sale I/O devices:
v Touch screen, key pad, and MSR
v USB I/O
v
Pointing device; mouse
USB devices and hot swapping
Universal Serial Bus (USB) is an open industry standard (IEEE and EIA) for a 12 Mbps
serial bus. This standard makes system functionality easy to expand.
Systems that are USB-compliant detect when you add or remove a USB peripheral
device. This process is known as enumeration. Enumeration identifies and manages the
necessary device state changes during the attachment and removal. The USB system
automatically configures each added USB device as soon as the device is physically
attached to the system. You no longer need to install drivers or configure dip switches,
jumpers, IRQ settings, and I/O addresses. This feature of USB is referred to as hot
swapping, plug and play, hot plugging, or hot insertion.
Indicators and user controls
The 4820 SurePoint Solution provides the following indicators and user controls:
v
Dual color LED:green power-on/resume indicator; orange backlight dim (system off)
v
Power on/Resume
v Brightness
External ports
The 4820 SurePoint Solution provides the following external ports:
v
USB touch, keypad, MSR input (Touch + I/O models only)
v
Two standard (non-powered) USB output
v
Video 26-pin analog video input
v DC input
Power management
Power management is through DPMS and complies with the VESA standard. The table
below describes the power management states.
Table 12-3. Power management states
Operating mode USB/analog
Off 3W
DPMS Off 3W
DPMS Suspend 3W
12-2
4820 SurePoint Solution System Reference