Custom Keypad Encoders and Keypads
Dan-Mar
designs and manufactures Custom Keypad Encoders and Keypads for IBM compatible computer applications. The encoder,
along with a custom keypad, provides a fully operational
keyboard. Encoders can be programmed to fit your specific application and supplied
with or without keypads.
Dan-Mar can design
and manufacture a keyboard system specifically to fit your application.
Please allow us to quote your requirements.
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ENCODER
FEATURES
The custom keypad encoder
will support up to 128 keys arranged in an 8 x 16 matrix. It supports the
standard PC-AT keyboard scan codes and communications protocol, and allows
a custom keypad to be used like a standard PC keyboard. It is powered
from the PC's keyboard port. The encoder debounces switch inputs and can
support up to 3 simultaneous key presses*. It can also be programmed to
block simultaneous key presses. The encoder will support typematic repeat
of a held key if desired.
Options include an input
for a standard PC-AT keyboard, and up to 7 extra
output connections that can be programmed for special functions such as
backlighting control, keyboard status (Caps Lock, Num Lock, Scroll Lock),
LCD driver (4 data lines) and relay drivers. Not all options are available
simultaneously.
Additional value-added
circuitry can be added to the keypad encoder to process data from the PC
for display and to control peripheral devices.
*For simultaneous key
presses, the matrix must be arranged to prevent a "phantom" key
with each group of 3 desired keys. The encoder does not support the PS/2
extensions to the AT protocol. The encoder will not work with an XT type
computer. |
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Keypad Encoder with 6 pin
right angle mini-DIN host computer connector, right angle keypad
connector and single row straight special functions connectors. |
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Keypad Encoder and
additional circuitry to process data from the PC parallel port. |
ENCODER
OPTIONS
Note: not all options are simultaneously available.
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Up to 128 keys standard. Additional key inputs available. |
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Connectors:
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Host computer:
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5 pin right angle
DIN. |
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6 pin right angle
mini-Din (PS2). |
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1 x 5 straight or
right angle 0.100" header. |
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2 x 3 straight or
right angle 0.100" header. |
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Keypad:
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1 x 28 straight or
right angle 0.100" header. |
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PC-AT Keyboard:
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6 pin right angle mini-DIN
(PS2). |
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Output functions:
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1 x 5 and 1 x 14
straight or right angle 0.100" header. |
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2 x 7 straight or
right angle 0.100 " header. |
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Simultaneous key presses:
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Specific keys. |
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Block simultaneous key presses. |
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Typematic repeat:
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Standard 500 millisecond delay / 100
millisecond rate. |
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Non-standard timings. |
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Keyboard input:
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Accepts a standard PC-AT
keyboard. |
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Output functions:
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Three open collector
transistor outputs, 0.1 ampere maximum current each. |
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Seven logic level
outputs. |
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Liquid Crystal Display
(LCD) driver, 4 data and 3 control lines. |
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Additional outputs are
available if fewer than 128 key inputs are required. |
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Size:
| 3.25 x 3.30 in. (8.26 x
8.38 cm.) with a mounting hole in each of the four corners. |
| Custom PCB layouts (including surface mounted components)
are available. |
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A sample keypad must be provided for testing
the firmware for each application. A prototype must be tested with the end use
computer to ensure compatibility. While not every keyboard or encoder will work
with every computer, it should be possible to resolve any compatibility problems
for computers of the same make and model.
KEYPAD
FEATURES
Custom keypads are designed
to meet customer's specific requirements. They may be any shape or size and
can be illuminated with embedded LED's or with fiber optics driven by a
variety of light sources, including LED's. Display windows with various gray
and colored filters may be an integral part of the keypad overlay. Encoders
can be provided to interface the keypad to an AT computer. The encoder may
be unattached, attached to the back of the keypad or be a value-added
subassembly if a printed circuit board (PCB) is already a part
of the keypad. Also, other electronic circuitry may be added to the keypad
PCB or to the encoder PCB thus lowering overall costs and providing one source procurement.
Membrane keypads are
versatile, offering multi-color graphic overlays, display windows,
unusual key shapes and sizes and long life.
Silicon rubber elastomer keypads are
especially suited for harsh environments. Their key action resembles
conventional computer keyboards.
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Custom membrane keypad,
encoder, LCD and stainless steel bezel.
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Custom membrane keypads
for use with Keypad Encoders. |
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Custom silicone rubber elastomer
keypads, one with a powder coated aluminum bezel (left), for use with
encoders. |
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FULLY
OPERATIONAL KEYBOARD
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QWERTY layout. |
| Sealed Membrane
embossed keys. |
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Encoder for standard PC-AT keyboard scan codes and
protocol. |
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ABS enclosure. |
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12.5" x 6.5"
x 1.5" |
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Choice of many colors
and options. |
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KEYPAD
OPTIONS
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Membrane keypads:
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Tactile keys. |
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Non-tactile keys. |
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Polyester snap
domes. |
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Metal snap domes. |
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Variety of switch forces. |
| Multi-color graphic
overlays. |
| Lenses |
| Insertable legends,
factory or field installed. |
| Embossed keys. |
| Hard-coating for
scratch resistance and anti-glare coatings. |
| Aggressive adhesives. |
| Variety of shapes and
sizes. |
| Mylar or polyester backed
(flexible). |
| Printed circuit board
backed (may contain value-added electronics such as a keycoder or other
circuitry). |
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Silicone Rubber Elastomer
keypads:
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Tactile keys. |
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Non-tactile keys. |
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Conductive rubber
contacts. |
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Membrane contacts. |
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Metal dome
contacts. |
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Illumination:
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Individual keys using
LED's. |
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Fiber optics backlighting
using a variety of light sources including LED's. |
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LED status indicators. |
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Hidden or secret switches. |
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Shielded |
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Sealed and water resistant. |
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Bezels. |
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Enclosures. |
 
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Dan-Mar
Company Inc.
