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PDF LK204-24-USB Data sheet ( Hoja de datos )
| Número de pieza | LK204-24-USB | |
| Descripción | Technical Manual | |
| Fabricantes | Matrix | |
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LK204-24-USB
Technical Manual
Revision: 1.0
1 page  
1 Introduction
The LK204-24-USB is equipped with the following features;
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• 20 column by 4 line text display
• Built in font with provision for up to 8 user defined characters
• USB communication or serial TTL communication
• Use of up to 100 modules on the same USB host
• Fully buffered so that no delays in transmission should ever be necessary
• Ability to add a customized splash / start up screen
• Use of "Remember" functions to save settings
• Software controlled contrast
• Software controlled backlight brightness
• Backlight with configurable time-out setting up to 180 minutes
• Use of up to a 24 key keypad with a 10 key buffer
• Six general purpose outputs for a variety of applications
• 4 Advanced general purpose outputs
• 3 Low power general purpose ouputs
• Horizontal or vertical bar graphs
• Power and data from one USB cable
• Extended temperature option
• A perfect fit to Matrix Orbital’s PC Bay inserts without any modifications
• Dallas 1-wire Bridge
1.1 What to Expect From the LK204-24-USB
The LK204-24-USB is designed as the display unit for an associated controller. The controller may be
anything from a single board, special purpose micro-controller to a PC, depending on the application. This
controller is responsible for what is displayed on the screen of the display.
The display provides a simple command structure which allows texts and bar graphs to be displayed on
the screen. Text fonts are built in and use standard ASCII mapping. Provision is made for up to 8 user
defined characters.
The screen is backlit for low light situations. Backlighting may be turned on or off under program
control. Contrast is adjustable to compensate for differing lighting conditions and viewing angles.
General purpose outputs allow the controller to switch up to six electronic or electro-mechanical devices
by issuing commands to the display unit. These can be used for controlling LEDs, relays, etc.
1.2 What Not to Expect From the LK204-24-USB
The display does not include bitmap graphics capability, except that permitted by defining special char-
acters.
Matrix Orbital
LK204-24-USB
1
5 Page 
Figure 5: Jumpers 1 and 2
The display can be powered by the USB port or by external power. Soldering Jumper 1, and removing
Jumper 2 will allow for power to be supplied externally. The advantage to this is the display will power up
www.DataSheet4U.com right away, allowing fans to start, for example, without waiting for the OS to power the display. In addition,
if the advanced GPOs are set to the +5V position power will be drawn from external power rather than the
USB port, thus allowing higher current draw.
NOTE Jumpers 1 and 2 are ON from factory.
2.1.3 USB Communications
A standard B type USB header is provided on the display for USB communication. The USB cable pro-
vides power and data to the display. There are two ways of communicating to the display. Under Windows,
the user will have direct access to the display drivers or create a virtual COM Port (VCP). With the VCP,
a new COM Port gets created in Windows. Under the control panel the user can set all the options for the
USB device, including speed. Windows 98, Windows ME, Windows 2000, and Windows XP drivers have
been tested and work. VCP drivers are also available for Apple OS-X, OS-8, and OS-9. Linux drivers are
available as well, but have not been tested by us, nor will Matrix Orbital be able to provide any support for
them.
For more information please visit ¡ ¢ ¤£¦¥¡§¡¨©¢£!"#£
8bit, no parity, one stop bit.
Speed: 19.2 Kb/s.
Table 5: USB ID
PID
FA00
FA01
FA02
FA03
FA04
VID 0403
Description
USB 2 Serial Communication
MX2 / MX3
MX4 / MX5
LK / VK202-24-USB
LK / VK204-24-USB
Matrix Orbital
LK204-24-USB
7
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