Matrix-orbital GTT70A Uživatelský manuál stáhnout pdf (Strana 9)

5 Command Summary

1.2 Interactive Input

Keypad

Unique values can be assigned for up to 25 keys. When a key event occurs it will be saved to a 20 key

buffer. Key events will generate a return message that can be transmitted immediately or polled by

toggling the auto transmit key press command. A sample return message is shown below.

Table 6: Example Keypad Response

Prefix

Message ID

Length

Event

Key ID

252

165

Key presses will have a message ID of 165, and a data length equal to the number of bytes currently in

the key buffer. Each key value will be preceded by an event byte as per the Keypad Event Types table.

Table 7: Keypad Event Types

Value

Event

Press

Release

Repeat

Touch

Touch input* allows the screen to return various types of up, down and move messages depending on

the reporting style. Two distinct styles are available: region and coordinate. Both generate a return

message with an identification number of 135, followed by event information.

Table 8: Touch Event Types

Value

Event

Down

Move

In coordinate mode, the GTT will send an event type as listed above followed by signed short x and y

coordinates of the touch location.

Table 9: Example Co-ordinate Response

Prefix

Message ID

Length

Event

252

135

In region mode, rectangular buttons are defined on the screen. When touch activities occur within

regions, a visual update accompanies the event report listed in the Touch Event Types table. Events that

occur outside defined regions may be reported as Region 255, when reporting is turned on.

Table 10: Example Region Response

Prefix

Message ID

Length

Event

Region

252

135

*Note: Please ensure your touch screen is calibrated correctly by locating a touchcal.dat file within the SYSTEM

folder of your SD Card. If necessary, calibration can be performed using the Calibrate Touch Screen command.

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