Pos Input/Output (I/O); Indicators And User Controls; External Ports; Power Management - IBM 4820 System Reference Manual

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: 2 standard (non-powered) USB output
v Video 26-pin miscellaneous data record (MDR) input
v DC input on
v Keypad/MSR (custom)

Power management

Power management is through DPMS and complies with the VESA standard. The table
below describes the power management states.
Table 9-3. Power Management States
The events for power management are as follows:
9-2
4820 SurePoint Solution System Reference
Operation Mode
Off
DPMS Off
DPMS Suspend
DPMS Standby
On
RS485/Analog
5W
5W
5W
5W
20W
USB/Digital
3W
3W
3W
3W
15W