Smart Panel Projector Driver Application Note
Sharp XG-E3500U
© 1999 SP Controls Inc. 601 Minnesota Suite 115 San Francisco, CA 94107
V. SPECIAL NOTE: SHARP FIRMWARE PROBLEMS
Nature of the Problems
a.
Several installations of the Sharp XG-E3500U using the original releases of this Driver have reported
sporadic loss of control problems associated with RS-232 power control of the projector. This problem
occurs extremely infrequently and has not been correlated with any specific conditions of use.
The problem is characterized by the inability of the Smart Panel to power on the Sharp when the Sharp is
in its ready state.
It is currently believed that under unknown conditions the Sharp ceases to respond to the RS-232
Power
commands. Investigation in the field on a malfunctioning unit showed normal RS-232 traffic. However, the
Sharp ignored a power command. The cases under which the Sharp ceases responding are not known.
b.
Several installations of the Sharp XG-E3500U have reported a “blooming” psychedelic display of colors,
resulting from the failure of one of the Sharp’s video boards to properly initialize.
The problem is characterized by a color-wash cycling, and scrambled or absent video display.
We have demonstrated that this problem may consistently be provoked by flooding the Sharp’s serial port
with data. We currently believe that the Sharp is incapable of correctly handling correctly formatted RS-
232 communications during limited but consistent conditions, even in normal operation.
Our Position
At present
these problems are known to be Sharp XG-E3500U firmware problems.
Onsite analysis of
this problem has revealed no Smart Panel malfunction whatsoever.
We are currently working with Sharp
help them patch the XG-E3500U firmware.
Advisory
We recommend that
all Sharp XG-E3500U installations should upgrade or install the Revision C
Driver.
This revision adjusts timing to be as conservative as possible; as a result, we believe problems should be
minimized or absent entirely. However, users and installers may notice slightly increased delays
introduced between switching and other control events.
Projectors updated to Revision C at a test location have so far experienced
no problems with this revised
Driver.
Please notify SP Controls technical support at once if any installation exhibits control problems of
the type described above with the Revision C driver.
What to do in an Emergency
In all cases, the field remedy for control failures has been to power cycle the Sharp.
No reconfiguration
or power cycling of the Smart Panel has been necessary at any site where the problem has
occured.
VI. REVISION HISTORY
1. Revision A (June, 1998)
Initial release.
2. Revision B (February, 1999)
Changed to use IR/Wired Remote for Power On/Off.
3. Revision C (December, 1999)
Adjusted timing to address Sharp firmware problems.
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