TIP-4131SCE Vishay, TIP-4131SCE Datasheet - Page 5

• Manufacturer Part Number: TIP-4131SCE
• Description: 12.1? Infrared Touch Panel
• Manufacturer: Vishay

TIP-4131SCE
Vishay Dale
COMMAND/RESPONSE DESCRIPTION (CONTD.)
Sound beeper, tt = duration (00 to FF) (2Ftt)
This command sends a logic 0 (active state) to pin 2 of J4.
The duration of the beep can be controlled in 10 msec incre-
ments from 0 msec (00) to 2.55 sec (FF). Note - 2C may not
be used as an argument as it will cause a reset.
*Normal X
Invert X
*Normal Y
Invert Y
The standard configuration for the touch panel places the XY
origin at the lower left corner, consistent with the Cartesian
coordinate system. Upon issuing the INVERT Y command,
the origin becomes the upper left corner, consistent with the
video industry standard. These commands allow the user to
move the origin to any corner to accomodate different stan-
dards or third party mechanical packages which may have the
touch panel rotated 180 degrees on the display. To cancel an
INVERT X or INVERT Y command, a NORMAL X or NORMAL
Y command must be executed. These commands may also
be implemented with jumpers. Placing a shunt on NOR X
causes X data to be normal (default), and removing the shunt
causes inverted X data. Similarly, placing a shunt on NOR Y
causes Y data to be normal (default), or removal causes in-
verted Y data. The jumper selected options may be over-rid-
den with the software commands.
Failed beam time-out (3A t)
If any IR beam is broken for an extended time due to blockage
of the beam or failed optical components, the touch panel will
ignore that beam after a predetermined number of scans. (This
is to prevent failed beams from interfering with touch sens-
ing). The actual failed beam detection time depends on the
modes of operation and the size of the touch matrix. When
using the CONTINUOUS mode with AUTOMATIC REPORT-
ING enabled, the time is typically 25-30 seconds. If the appli-
cation requires longer touch times, then the time may be ex-
tended using the FAILED BEAM TIME-OUT command. The
command accepts arguments from 1 to F.
Request failed beam report (28)
This command returns the address of any infrared diode/
phototransistor pair that are blocked (as when a stylus is in
the panel) or have several failed scans. (The time period can
be extended by using the FAILED BEAM TIME-OUT com-
mand). The report uses the following format:
47 = start of failed beam report
aa-nn = physical address of failed LED/Phototransistor pair.
FF = end of report
www.vishay.com
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(36)
(37)
(38)
(39)
12.1” Infrared Touch Panel
Reset touch panel (2C)
After issuing the RESET command, the touch panel is returned
to its power up condition and all operating modes are returned
to their default state and the buffer cleared.
Request software revision number (30)
Request touch matrix size (33)
Request model number (35)
These commands are provided for configuration control and
diagnostic purposes.
RS-232 framing or overrun error (45)
An RS-232 error indicates communication problems.
Buffer overflow error (4F)
Buffer overflow occurs when the input command buffer is ex-
ceeded due to lack of handshaking.
INITIALIZATION
Initialization is performed by the host computer and must be
done each time the touch panel is powered up or the RESET
TOUCH PANEL command is issued. The initialization pro-
cess requires setting the desired coordinate reporting modes,
enabling or disabling AUTOMATIC REPORTING, and enabling
or disabling the touch panel. Default settings are shown in the
COMMANDS table.
When touch coordinate information is required by the host
computer, the touch panel must be enabled. The flow of touch
coordinates from the touch panel to the host computer can be
controlled by enabling or disabling AUTOMATIC REPORTING.
With AUTOMATIC REPORTING enabled, coordinate reports
are sent to the host as soon as they become available. If the
host computer is performing a task which does not require
touch coordinate information, AUTOMATIC REPORTING may
be disabled.
INITIALIZATION/OPERATION-EXAMPLE
In the following example the touch panel is initialized to report
coordinates only when a stylus is entered into the touch panel.
The touch panel is enabled by default, and coordinate report-
ing is not desired unless requested, so AUTOMATIC REPORT-
ING is left disabled by default.
As a result the touch panel must be continuously polled with
REQUEST ONE COORDINATE REPORT (2B) to determine if
an enter point coordinate report is available. When a report is
available, it will be sent to the host. If no report is available,
the touch panel will send code 48 (hex) to the host.
Document Number: 37069
Revision 28-Jun-01