LK404-25-E Matrix Orbital, LK404-25-E Datasheet - Page 37

• Manufacturer Part Number: LK404-25-E
• Description: LCD Character Display Modules 40x4 Grn/Yel Ext Temp
• Manufacturer: Matrix Orbital

Specifications of LK404-25-E

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

connector. The keypad is scanned whenever a key is pressed;there is no continuous key scan. This means
that key presses are dealt with immediately without any appreciable latency. This also prevents electrical
noise which is often caused by continuous key scans.
9.1.1 I
the first unread key press. A read is initiated by writing to the module with its base address plus 1, then
clocking the module’s return byte after the module releases the SDA line. Much more detail on this basic
I
9.1.2 RS232 Interface
rate. This behavior can be modified using commands found in the next section.
9.2 Auto Transmit Key Presses On
9.3 Auto Transmit Key Presses Off
Matrix Orbital
2
C function can be found in the I
The keypad is read by I
By default on any press of a key, the module will immediately send out the key code at the selected baud
Syntax
Description
Remembered
Default
Syntax
2
C Interface
2
In this mode, all key presses are sent immediately to the host system
without the use of the poll keypad command. This is the default mode
on power up.
NOTE This command is not available in I
Yes
On
C master read. In short, this means that a read of the module will always return
Hexadecimal
Decimal
ASCII
Hexadecimal
Decimal
ASCII
2
C specification by Phillips.
0xFE 0x41
254 65
254 “A”
0xFE 0x4F
254 79
254 “O”
LK404-25
2
C.
33