EA KIT320-8CTK ELECTRONIC ASSEMBLY, EA KIT320-8CTK Datasheet - Page 5

• Manufacturer Part Number: EA KIT320-8CTK
• Description: LCD Graphic Display Modules & Accessories Blue/White Contrast RS-232 Snap-In Kit
• Manufacturer: ELECTRONIC ASSEMBLY

Specifications of EA KIT320-8CTK

• Pixel Density: 320 x 240
• Module Size (w X H X T): 148 mm x 120.4 mm x 36 mm
• Viewing Area (w X H): 120 mm x 92.1 mm
• Backlighting: CCFL
• Background Color: Blue, White
• Attached Touch Screen: Yes
• Product: Graphic LCD Module
• Style: LCD Graphic Display
• Interface: RS-232
• Display Mode: Blue Negative
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

EXTERNAL MATRIX KEYBOARD
A matrix keyboard (anything from individual keys to an 8x8 matrix keyboard) can be connected at the
plug-in connection J120. The number of inputs and outputs of the ports (n1,n2=1..8) used is defined
and the key debouncing is specified (n3=0..7 in 50ms increments) by means of the ‘ESC Y M n1 n2
n3’ command. Please note when an external keyboard is connected that the digital inputs are reduced
by the number n1 and the outputs are reduced by the number n2.
Each key is generally switched between an output and an input. Each input has a 100kΩ (approx.)
pullup. In order to identify double keystrokes, the outputs must be decoupled from each other. This
is best done with Schottky diodes (e.g. BAT 43).
Transmitting the keystrokes
At each keystroke (key number 1..64), the associated matrix macro is executed or, if no macro is
defined, the key number is transmitted with code letters. The release of the key is not transmitted. If
the release of the key is to be transmitted as well, this can be done by defining matrix macro no. 0.
Note If the CTS handshake line does not permit transmission, up to 8 keystrokes are stored in the
key buffer. When the buffer is full, older keystrokes may be lost.
Determining the key number:
Key no. = (output no. - 1) * no. of inputs + no. of outputs
(output = MOx, input = MIx).
Example: Connection of 4 keys in 3 variations
- Variant 1:
- Variant 2:
- Variant 3:
Type 1: 2x2 Matrix
The 4 keys are defined as a 2x2 matrix by means of the ‘ESC Y M 2 2 ..’ command.
The 4 keys are defined as a 1x4 matrix by means of the ‘ESC Y M 1 4 ..’ command.
If only one output is used (4x1 matrix), the keys can also be connected to ground
The keys are connected to 2 inputs (MI1, MI2) and 2 outputs (MO1, MO2). The
outputs are decoupled from each other by means of diodes so that double
keystrokes can be identified. There are 6 inputs and 6 outputs available as port
connections.
The keys are connected to 4 outputs (MO1, MO2) and read in via input MI1. There
are 7 inputs and 4 outputs available as port connections.
and read in directly at the inputs (= 4x0 matrix). The 4 keys are defined at the 4
inputs (MI1..MI4) by means of the ‘ESC Y M 4 0 ..’ command. There are 4 inputs
and 8 outputs available as port connections.
Type 2: 1x4 Matrix
EA KIT320-8
Type 3: 4x0 Matrix
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