Matrix Orbital LK202-25 Legacy - Manual (Page 4)

LK202-25 rev 3 4
1. Introduction
Your LK202-25 has 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 RS232
§ Communicate over RS232 or I²C
§ Use up to 16 modules on the same 2-wire I
2
C interface
§ Fully buffered so that no delays in transmission are ever necessary
§ Add your own Splash/Start-up screen
§ Use our "Remember" functions to save settings
§ Software controlled contrast, backlight with configurable time-out setting up to 180 minutes and
software controlled speed
§ 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 our PC Bay inserts without any modifications
1.1 What it Does
The LK202-25 is designed as the display unit for an associated controller. The controller may be anything
from a single board, special purpose microcontroller to a PC, depending on the application. This
controller is responsible for what you see on the screen of the LK202-25.
The LK202-25 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 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 it Does Not Do
The LK202-25 does not include bitmap graphics capability, except that permitted by defining special
characters.
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. Note that the keypad is not used to directly control
any aspect of the operation of the LK202-25, which acts simply as a matrix to serial converter. If you
want to use the keypad to control the LK202-25 display you must program your controller accordingly.
1.4 Setup for Testing
Before setting up your application you may want to try out the LK202-25. This is easily done with a PC.
Here's what you'll need: