Matrix Orbital PK202-25 - Manual (Page 5)

1 Introduction
The PK202-25 comes equipped with the following features:
• 20 column by 2 line text PLED 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 RS-232 or I
2 C
• Use of up to 127 modules on the same 2 wire I
2 C interface
• 1-wire bus that is capable of communicating with many devices over a single wire plus a ground
refernce
• Fully buffered so that no delays in transmission are ever necessary
• Ability to add a customized splash / startup screen
• Software controlled brightness with configurable time-out setting up to 90 minutes and software con-
trolled speed
• Use of 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
• Medium digit capability
• 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 PK202-25
The display 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. 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 PK202-25
The display does not include bitmap graphics capability, except that permitted by defining special char-
acters.
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