Matrix Orbital LK202-25 Legacy - Manual (Page 5)

1 Introduction
The LK202-25 comes equipped with the following features:
• 20 column by 2 line text display
• Built in font with provision for up to 8 user defined characters
• Speeds from 1200 bps to a lighting fast 19.2 Kbps over RS-232
• Communication over I
2 C or RS-232 (with software controlled speed)
• Use of up to 127 modules on the same 2-wire I
2 C interface
• One wire bus capable of communicating with many devices over a single wire plus a ground reference.
• Fully buffered so that no delays in transmission should ever be necessary
• Ability to add a customized splash / start up screen
• Use of Matrix Orbital’s "Remember" functions to save settings
• Software controlled contrast
• Backlight with configurable time out setting up to 90 minutes
• Use up to a 25 key keypad with a 10 key buffer
• Six general purpose outputs for a variety of applications
• Horizontal or vertical bar graphs
• Variable power options, +5V or +9V to +15V
• Extended temperature option
• Fits Matrix Orbital’s PC Bay inserts without any modifications
1.1 What to Expect From the LK202-25
The LK202-25 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 to allow text 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 luminous for low light situations. The display may be turned on or off under program
control. Brightness is adjustable to compensate for differing lighting conditions.
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 LK202-25
The display does not include bitmap graphics capability, except that permitted by defining special char-
acters.
1.3 Keypad Interface
The keypad interface takes row / column input and converts it to ASCII characters, which are delivered
out the RS-232 or I 2 C port to the associated controller. Please note that the keypad is not used to directly
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