Operator Led Control - Micros Systems Workstation 4 LX Service Manual

WS4 Technical Overview
PC87360 Super IO
Operator LED Control (REF: AB28 /ABRD36 - Sheet 19)
The Operator LED is mounted directly to the system board in the lower right-hand
corner. A light pipe attached to the top cover is positioned over the LED when the
cover is in place.
The Super IO includes two LED outputs,
bi-color LED with two anodes.
Green anode (A2), through series current limiting resistors R279 and R280.
When the Red and Green anodes are driven simultaneously, the LED produces a third
color, Amber. In addition, the LED outputs can be programmed to blink at rates of
0.25, 1, or 4 Hz. The Workstation 4 diagnostics utility, DEMODIAG, can demo all
LED colors and blink rates.
The POS application access the LED color and blink rates through the LED driver
(LED.DLL), a component of the platform software. The combination of three colors
and four blink rates yields the display modes summarized in Figure 2-8. Many of the
modes shown in the table below are undefined, and may be defined by the application
software.
Red
Rate Condition
0.25 Hz POST Error
1 Hz Undefined
4 Hz Undefined
ON Error - Image
Not Found
On DOC
2-14
LED1
Green
Rate
0.25 Hz
1 Hz
4 Hz
ON
Figure 2-8: Operator LED Colors and Blink Rates
and . Both outputs drive D31, a
LED1 LED2
drives the Red anode (A1) and
Condition Rate
Undefined 0.25Hz
Undefined 1 Hz
Undefined 4 Hz
System ON ON
Workstation 4 and 4 LX Field Service Guide
drives the
LED2
Amber
Condition
WS4 Booting
Undefined
Undefined
Suspend