J2 625 System Manual
Version 0.1 June15, 2012 (Draft)
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Power-On Hours
The MCU uses an internal timer to keep track of how many total hours the J2 625 has
been up and running in its lifetime. This number shows powered-up hours only, not the
powered but off/standby time. The accuracy of this timer is only about +/- 5% and is to
be used as an approximate number. The value is stored in the MCU internal EEPROM.
Power Cycles
The MCU tracks the total number of times the unit has been powered off and on in the
power cycle counter. The count is stored in the MCU EEPROM and is used for
diagnostic purposes. The power-on and power cycles can only be changed at the factory.
Dim Timeout
This value is the amount of time the MCU waits if there is no touch activity before
dimming the screen. This same function is built into Windows 7 and Windows 8 drivers,
and should be used rather than the J2 625 hardware dimming. But for older operating
systems (such as XP) the J2 625 hardware dimming default should be used.
The default value for the hardware dim timeout is six minutes, but can be changed with
this utility from any value from 0-255 minutes.
Note: a value of zero will disable the hardware auto dimming function.
Once the dim timeout is reached the LCD screen will dim to the value set in Dim
Brightness. Any touch of the screen, such as MSR read, iButton read or keyboard activity
that changes the keyboard LED status will take the J2 625 out of auto dim mode. This is
all done via hardware, and no software drivers need to be loaded. If it is required, the J2
Dim Wake driver should be loaded if other activity is required to take the J2 625 out of
auto dim. This driver is described in the Dim Wake section of this manual.
