27963 Parallax Inc, 27963 Datasheet - Page 10

• Manufacturer Part Number: 27963
• Description: SOLUTIONS CUBED: MEMKEY
• Manufacturer: Parallax Inc

Specifications of 27963

• Accessory Type: Keypad Encoder
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Miniature Engineering Modules – MEMKey
PC/AT Operation
standard keyboard that can be attached to any PC or
single board computer that supports the PC/AT
keyboard protocol.
row/column configuration or the key values returned
for a key press need to be changed from the default
values, the MEMKey needs to be programmed in the
serial mode. See Serial Operation for more details.
protocol. It supports the mode II interface only. As
such, mode III commands such as set make/break are
emulated to ensure no communication error but they
are not implemented. The table below gives all of the
commands that are implemented and emulated.
Because modes I and III are used very rarely, the
MEMKey can interface to all desktop and laptop PCs
and single board computers with no problems.
addition, the Set/Reset Indicators command is emulated
because there are no indicator LEDs on the MEMKey.
Hardware Hook up
setup for using the MEMKey in PC/AT mode.
addition, the MODE jumper (J3) must be off to enable
the PC/AT mode.
connector as is GND. The CLK and DATA lines are
also supplied by the connector. The diagram below
gives the standard pin outs for both the DIN and mini-
DIN connectors that will mate with the connectors
found on most PCs. Note the KEY pin on the MEMKey
is not used. It is configured as an output low when in
PC/AT mode.
SOLUTIONS CUBED
530-891-8045
Command
Set/Reset Indicators
Echo
Select
Code
Read ID
Set Typematic
Enable
Default Disable
Set Default
Set All Keys
Set Key Type
Resend
Reset
In PC/AT mode the MEMKey operates as a
If attributes of the MEMKey such as the
The MEMKey supports a subset of the PC/AT
Supported commands
The connection diagram below shows the basic
Power(VDD) is supplied by the standard PC/AT
Alternate
Scan
Action
Emulated
Implemented
Emulated
Implemented
Implemented
Implemented
Implemented
Implemented
Emulated
Emulated
Implemented
Implemented
In
In
any type that fits within the 5 row by 4 column format.
With the default settings, the MEMKey will match a
Grayhill 96 series 4X4 matrix.
Connectors (looking into cable)
customized, there are two options. Solutions Cubed
can
Alternately, there is a serial MEMKey programming
board which runs off of a PC serial port available from
Solutions Cubed.
DIN Connector (male)
Pin
1
2
3
4
5
6
PC
CLOCK
1
The keypad attached to the MEMKey can be of
DATA
Basic connection diagram
DIN connector pin outs
For OEM customers that need the MEMKey
VDD
GND
program
4
NC
2
5
3
DIN
Clock
Data
NC
Ground
VDD
-
MEMKey
the
VDD
GND
TM
FM
KEY
MEMKeys
mini-DIN Connector (male)
3
1
mini-DIN
Data
NC
Ground
VDD
Clock
NC
5
Keypad
Columns
Rows
6
2
before
4
shipping.
DIN
9