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Document Number: 37078

4

Revision: 14-Jan-10

TIP-4735SEE-1

Vishay Dale

14" Infrared Touch Panel

COMMAND/RESPONSE DESCRIPTION

DC1, CtI Q, XON software handshaking (11)

DC3, CtI S, XOFF software handshaking (13)

RS-232 flow control is provided by these commands.

Note

• A shunt must be placed on (softhand) to allow software

handshaking.

Absence

of

a

shunt

requires

hardware

handshaking. (See also enable touch panel command)

Disable touch panel (stop scanning) (27)

The touch panel must be enabled for normal operation.

When the touch panel is disabled, commands are

processed as they are received, allowing changes in modes

of operation, but discarding any report operations. This

differs from XON/XOFF software handshaking. When the

touch panel receives an XOFF character (13), commands

are executed until the touch panel requires transmission of

a report, then all commands received are buffered and are

not executed until an XON character is received. If the buffer

becomes full, the touch panel sends XOFF.

Enable continuous/disable tracking mode (24)

This coordinate reporting mode will continuously report the

coordinates of a stylus that remains in the touch panel. This

mode can be used individually or in combination with enter

point, or exit modes. The following report format is used. If

more

than

one

stylus

enters

the

touch

panel,

a

non-contiguous report will be generated.

41 = start of coordinate report

xx yy = binary X and Y,

≥ 0, X, Y = FE if non-contiguous

Enable enter point mode (22)

This coordinate reporting mode will report the coordinates

of the point where a stylus is entered into the touch panel.

This mode can be used individually or in combination with

exit point, continuous, or tracking modes. The following

report format is used. If more than one stylus enters the

touch panel, a non-contiguous report will be generated.

42 = start of enter report

xx yy = binary X and Y,

≥ 0, X, Y = FE if non-contiguous

Enable exit point mode (20)

This coordinate reporting mode will report the coordinate of

the point where a stylus is removed from the touch panel.

This mode can be used individually or in combination with

enter point, continuous, or tracking modes. The following

report format is used. If more than one stylus enters the

touch panel, a non-contiguous report will be generated.

43 = start of exit report

xx yy = binary X and Y,

≥ 0, X, Y = FE if non-contiguous

Enable tracking/disable continuous mode (34)

This coordinate reporting mode will report the coordinates

of a stylus that remains in the touch panel, but only as the

stylus changes locations. This mode can be used

individually or in combination with enter point, or exit

modes. The following report format is used. If more than one

stylus enters the touch panel, a non-contiguous report will

be generated.

4E = start of coordinates report

xx yy = binary X and Y,

≥ 0, X, Y = FE if non-contiguous

Enable automatic reporting (29)

Request one coordinate report (2B)

When automatic reporting is enabled, coordinate reports are

reported to the host as soon as they become available. After

issuing the enable automatic reporting command, there may

be a report in the internal buffer which is not current. If a

sufficient amount of time has passed to allow this condition,

the first coordinate report returned should be ignored.

When automatic reporting is disabled, no coordinate reports

are reported unless requested with request one coordinate

report. If a stylus is entered into the touch panel after

automatic reporting is disabled, a coordinate report will be

generated and saved in an internal buffer (depending upon

coordinate reporting modes in effect) but will not be

transmitted until a request one coordinate report command

is received.

If no coordinate report is available in the internal buffer, the

touch panel will return a code 48 and continue to scan until

a stylus is detected. However, no coordinate report will be

reported until automatic reporting is enabled or the report is

requested with request one coordinate report.

Coordinate reports are reported with the following format:

Report type = 41, 42, 43, or 4E

xx yy = binary X and Y,

≥ 0, X, Y = FE if non-contiguous

Enable Beeper (2D)

Enabling the beeper sends a logic 0 (active state) to pin 2 of

J4 depending on which of the coordinate reporting modes

are enabled. If the enter mode is enabled, a pulse is sent for

every entry point. If the exit mode is enabled, a pulse is sent

for every exit point. If both modes are enabled, a pulse is

sent for every entry and exit point. Continuous and tracking

modes have no beeper outputs.

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 ms

increments from 0 ms (00) to 2.55 s (FF).

Note

• 2C may not be used as an argument as it will cause a reset.