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Hagstrom Electronics LP24 User Manual

Pc keyboard encoder
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LP24
PC Keyboard Encoder
User Manual

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Summary of Contents for Hagstrom Electronics LP24

  • Page 1 LP24 PC Keyboard Encoder User Manual...

  • Page 2: Table Of Contents

    Appendix A: Specifi cations Accessories Thank you for purchasing the HAGSTROM ELECTRONICS, INC. LP24. This product is confi gurable in a variety of ways to meet your specifi c requirements. Please take a few minutes to read this manual before using your LP24.

  • Page 3: Introduction To The Lp24

    PC as if they were entered from a standard keyboard. The LP24 is designed to be fully programmable by the user. This programmability feature allows the confi guration of the I/O as well as the selection of the keystrokes that will be sent to the PC. The LP24 stores the user’s confi...

  • Page 4: Computer And Keyboard Connections

    Simply plug the end of a standard PC keyboard into the LP24 “KBD” connector. This keyboard pass through feature allows for the use of an external keyboard with the LP24 unit. It is important to note that an external keyboard is not required for proper operation of the LP24 since the LP24 unit provides all the appropriate keyboard signals to the computer.

  • Page 5: Interfacing To The Lp24 I/O Header

    Interfacing to the LP24 I/O Header The 2 x 25 pin dual row header on the LP24 consists of 24 I/O pins with a Logic Ground at one end. The I/O signals are labeled on the LP24 as “A” through “X”. Each pin on the dual row header is connected in parallel with its adjacent pin.

  • Page 6: The Lp24Load Program

    Getting Started To begin using the LP24, follow the steps listed below. 1. With the PC’s power turned off, attach the LP24 to the computer as described on page 2 under the section titled “Computer and Keyboard Connections.”...

  • Page 7: The Program Screen

    The Program Screen The main program screen displays the confi guration settings for the LP24. A list of these settings and a description of how they pertain to the LP24 setup are listed below. Number of Rows: The number of Rows are selected from the drop down list.
  • Page 8 LP24 will not be repeated. *Note: The Typematic Enable/Disable option only applies to the devices connected to the LP24 I/O header. It will not affect the repeat functions of the PC keyboard. Column Pin Assignments: Column pin assignments are selected from their corresponding drop down list.

  • Page 9: File Menu Selections

    This list provides several options that include creating and saving fi le confi gurations as well as reading and writing to the LP24. A list of these options along with descriptions of how they pertain to the LP24 setup are listed below.
  • Page 10 Make sure that the LP24 is connected to the PC before performing either the “Read to LP24” or “Write to LP24” operations. If the LP24 is not present, a “The LP24 was not Found” error will be displayed on the computer screen.

  • Page 11: Sample Lp24 Confi Guration

    Sample LP24 Confi guration The following exercise demonstrates how to program the LP24 to scan a keypad. The keypad in the example is a 4x4 matrix (16 key) device. Step 1 Select the Number of Rows on the screen and set it to 4. Select the Number of Columns, and set that value to 4 as well.
  • Page 12 Step 2 Now that the size of the matrix to be scanned has been selected, the pins of the LP24 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.
  • Page 13 Step 3 With the size of the matrix now defi ned, and the I/O pins selected, assign the keys to be emulated to each position in the matrix. To assign keys, click on the desired matrix position. A diagram of the keyboard will be displayed, as shown below. Click on the representation of the key to assign it to the matrix position.
  • Page 14 In the example illustrations, the user clicked matrix position Row 1, Col 3 and assigned the key “C” to it. Continue selecting each position in the matrix and assign the desired keys from the keyboard diagram until the matrix is fi...
  • Page 15 Del button (shown below). Any position in the LP24 matrix can be modifi ed by one or a combination of two of the Shift, Alt, or Ctrl keys using the method described above.
  • Page 16 The following diagram shows the completed setup created in this example. Note the presence of modifi er keys in Row 4, Col 3 and Row 4, Col 4.
  • Page 17 fi le name under which to save the confi guration. Step 6 Load the LP24 with the confi guration. Be sure that the LP24 is connected to the PC. Once the LP24 is loaded, it will begin running the new setup.

  • Page 18: Error Messages

    “The LP24 was not found” This error occurs if the computer cannot communicate with the LP24 when trying to save to the LP24 or read from the LP24. Check the cable connections to make sure none of them are loose or unplugged.
  • Page 19 If a header pin is used to designate more than one row or column or is used for both a row and a column, this error will be displayed when saving the confi guration to a fi le or to the LP24. Check the matrix confi guration and eliminate redudant pin letters.

  • Page 20: Lp24 Operating Tips

    Review the matrix table for the desired responses. • The maximum recommended cable length from the computer to the LP24 is 10 feet. This distance is also the maximum length that should be used on connections from the switches or keypads to the LP24 I/O header.

  • Page 21: Appendix A: Lp24 Specifi Cations

    Appendix A: LP24 Specifi cations 2.5” .125 Dia. (4) 2.0” .125 .125 5 Volts DC +/- 5% Operating Voltage 12 ma Typical Operating Current 0 to 70 Degrees C Operating Temp. AT/PS/2 Compatible (6 pin PC Interface miniDIN or 5 pin DIN)

  • Page 22: Accessories

    Accessories MTA100-10-12 LP24 Header MTA100-12-12 MTA Harness to connect to the LP24 header. Features a right angle connector that plugs directly to the LP24 header, and provides 12 inches of discrete wire for each header pin. KE-MM6-mini 6 foot 6 pin miniDIN male/male connecting cable between encoder and PC keyboard input.

  • Page 23: Warranty

    Depending on the state in which you live, you may have additional rights. Great care has been taken during the assembly, testing, and burn-in of your LP24 to ensure its performance. If you have any questions, please send us an email.
  • Page 24 HAGSTROM ELECTRONICS, INC. sales@hagstromelectronics.com www.hagstromelectronics.com Copyright © 2025 HAGSTROM ELECTRONICS, INC. V. 10.20...

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