Matrix Orbital GLK12232-25-WBL - Manual (Page 19)

5.2 Connections
Figure 7: Keypad Connector
The connector is not ’keyed’ so the keypad will probably plug in either of two ways. The display will
not be damaged by reversing the connector. However, the keypad will generate a different ASCII character
mapping for each position. If the connector has fewer than 10 pins it should be centered on the display
connector.
The diagram shows the logical layout (row 1, column 1 in upper left). The connector for the keypad is a
10 pin 0.1" spacing male header. Pins 1 through 5 are columns and pins 6 through 10 are rows. 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.
NOTE Please note that keypads may be laid out in a different pattern. If this is the case,
the user will need to interpret the key codes differently.
Table 4: Keypad Layout
Columns
1 2 3 4 5
1 A B C D E
Rows 2 F G H I J
3 K L M N O
4 P Q R S T
5 U V W X Y
NOTE The keypad connector must be wired with columns on one side and rows on the
other side of the center of the connector. In situations where the keypad isn’t wired this
way an adapter will need to be made, or the user should rewire the connector to meet this
requirement.
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