Hagstrom KEUSB24 User Manual - Keusb24 Operating Tips
KEUSB24 Operating Tips
Please check the following items before contacting us.
• When connecting the KEUSB24 to a PC use a standard
USB A-B type Cable.
• Check the KEUSB24 confi guration. Check the I/O
confi guration for the number of Columns, Rows, etc.
Review the matrix table for the desired responses.
• The maximum recommended cable length from the
computer to the KEUSB24 is 10 feet. This distance is also
the maximum length that should be used on connections
from the switches or keypads to the KEUSB24 I/O
header.
• If using a Device ID jumper, only make changes to
it when the power to the unit is off as it is sampled at
power on or reset.
• While the KEUSB24 only scans a matrix, running a
1 x 23 matrix essentially provides 23 individual inputs
without the inherent matrix issues.
*Note:
For any questions that are not answered in this
manual, please send us an email or call customer service. We
have customer service available from 8:00 am to 5:00 pm (EST)
Monday through Friday.
customer service email: sales@hagstromelectronics.com
Toll Free 888-690-9080, or (540) 465-4677
Interfacing to the KEUSB24 I/O Header
The 2 x 25 pin dual row header on the KEUSB24 consists of 24
I/O pins with a Logic Ground at one end. The I/O signals are
labeled on the KEUSB24 as “A” through “X”. Each pin on the
dual row header is connected in parallel with its adjacent pin.
Therefore, each I/O signal is available on two different pins.
Use the supplied KEUSB24.EXE program to confi gure the I/O pins
as either Rows or Columns. Keystrokes are initiated by shorting
a Row pin to a Column pin through a contact closure. The pins
that are defi ned as Columns will sink current while scanning the
matrix. The Rows are used to read the status of the inputs when
a Column is active.
*Note:
The switch, keypad, or input device that is used must
be capable of carrying at least 1mA of current. In addition to
switches and keypads, other electronic circuits may also be used
to generate keystrokes, provided that they do not exceed the 5
volt logic level range of the KEUSB24 I/O.
3
Figure 1.1
Inputs are activated by
shorting a pin defi ned
as a Row to a pin
defi ned as a Column.
Column
Column
Row
18