Workstation 5 Field Service Guide
2-31
Workstation 5 System Board Technical Descriptions
Point Of Sale Interfaces
+24V Regulator (REF: ABRD88 - Sheet 30)
To support cash drawers with +24V solenoids,
VCC12
is converted to
+24V by U33, a LM2733 boost converter. The output of the converter,
VCC24
is fed to a switch consisting of Q4 and Q5.
The GPIO signal
VCC24_ON
enables the switch.
VCC24_ON
is controlled
by the ‘Cash drawer voltage’ field in the BIOS Special Configuration
screen. See Chapter 2 of the Workstation 5 Setup Guide for more
information about BIOS Setup.
System Board Hardware Revision (REF: ABRD88 - Sheet 16)
The API as well as the BIOS can determine the hardware revision of the
System Board it is operating on. The WS5DiagUtility uses the API to display
the hardware revision as part of the System Information screen.
Refer to schematic ABRD88-E, Sheet 16, Grid A5. The interface consists of
four traces on the system board,
REV0
-
REV3
, each connected to ground. The
traces are located on the ‘solder’ side of the board. For the REV E board, the
REV2
track is cut and therefore pulled high by R80, while
REV0
,
REV1
and
REV3 remain at ground. This yields a 4-bit value of 0100 and the API and
BIOS interprets this as Revision E.
