LK202-25-USB-GW Matrix Orbital, LK202-25-USB-GW Datasheet - Page 38

• Manufacturer Part Number: LK202-25-USB-GW
• Description: LCD Character Display Modules White Background Blue Text
• Manufacturer: Matrix Orbital
• Series: LK202-25r

Specifications of LK202-25-USB-GW

• Character Count X Line: 20 x 2
• Module Size (w X H X T): 116 mm x 37 mm x 25.73 mm
• Fluid Type: STN
• Voltage Rating: 5 V
• Operating Temperature Range: 0 C to + 50 C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

9.5 Clear Key Buffer
9.6 Set Debounce Time
Matrix Orbital
Description
Remembered
Syntax
Description
Remembered
Syntax
Parameters
Description
Remembered
Default
This command returns any buffered key presses via the serial interface.
The host system must be set up to receive key codes. When the display
receives this command, it will immediately return any buffered key
presses which may have not been read already. If there is more than one
key press buffered, then the high order bit (MSB) of the returned key
code will be set (1). If this is the only buffered key press, then the MSB
will be cleared (0). If there are no buffered key presses, then the
returned code will be 0x00. Please note that to make use of this
command, the “Auto Transmit Key Presses” mode should be off.
No
This command clears any unread key presses. In a menu application, if
the user presses a key which changes the menu context, any following
key presses may be inaccurate and can be cleared out of the buffer
between menu changes to prevent jumping around the menu tree. It may
also be used, in effect, to reset the keypad in case the host application
resets for whatever reason.
No
This command sets the time between key press and key read. All key
types with the exception of latched piezo switches will ’bounce’ for a
varying time, depending on their physical characteristics. The [time]
value is in increments of 6.554ms. The default debounce time for the
module is 8 (about 52ms), which is adequate for most membrane
keypads.
Yes
8
Hexadecimal
Decimal
ASCII
Hexadecimal
Decimal
ASCII
Parameter
time
0xFE 0x45
254 69
254 “E”
0xFE 0x55 [time]
254 85 [time]
254 “U” [time]
LK202-25-USB
Length
1
Description
Debounce time in increments of
6.554ms (0 - 255).
34