Hagstrom KEUSB24 User Manual page 12

Step 2
Now that the size of the matrix to be scanned has been selected,
the pins of the KEUSB24 I/O header to be used as rows and
columns must be selected. The keypad example has 8 interface
pins. The easiest way to plug the keypad in is to attach it 1:1 to
the I/O header. For this example, the header pins "A" through
"H" are used as the connection point.
*Note:
Any 8 of the KEUSB24 pins could have been used for
this example.
Since the Columns and Rows for the example keypad are
intermixed, the pin defi nitions for the Rows and Columns must
be assigned. Highlight the Column pin designations, and assign
them as follows:
Col 1 = Pin D, Col 2 = Pin A, Col 3 = Pin G, Col 4 = Pin H
Select the Row Pin defi nitions next, and change them to:
Row 1 = Pin E, Row 2 = Pin C, Row 3 = Pin F, Row 4 = Pin B
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