Chapter 3: Hardware Installation 3-5
• USB Interface (Powered)
Connect the I/F cable to a powered 12V USB + Power connector on the
terminal.
• USB Interface (Non–Powered)
Connect the I/F cable to a non–powered USB connector on the terminal.
Connect a Power Brick to the I/F cable and an AC outlet.
Diagnostics
The 5976 Customer Display has internal Power Up Diagnostics that occur soon after
power–up or if a Reset Display command is received from the host software.
When the hardware is powered down, all registers and memory are lost. No recovery
is possible.
The Power Up Diagnostics include the following tests:
• Microcontroller test
• External Memory Character test
• Display test
External Memory Character Test
A test is performed every loading of character set from the external Flash to the
Microcontroller memory. The calculated checksum value of the stored character set is
compared to the checksum found on the character set header information. If an error
is discovered, the Microcontroller will erase the character set on its memory.
Display Test
If the display is not connected to a host through a serial lines or USB, it runs an extra
test that turns on all pixels on the display (character cells) for about four seconds. This
permits a user to examine the display for any pixel failure, but doesn’t require him to
execute this test on every power up. The unit does not have the capability to
determine if the Display Test passed. Once diagnostic testing is completed, line states
are returned to normal and the firmware branches to its idle routine.
The host is able to detect a Retail Display failure by detecting exception conditions on
the RTS or Busy lines for at least three seconds.
Note: When the I/F receives a Reset command, only the Microcontroller Test and
External Memory Test Character are executed. The Display Test is not executed.
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