Matrix-orbital VK204-25 Legacy Manual do Utilizador descarregar pdf (Página 4)

1 Introduction

The VK204-25 comes equipped with the following features;

• 20 column by 4 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

C or RS-232

• Use of up to 16 modules on the same 2 wire I

C interface

• Fully buffered so that no delays in transmission are ever necessary

• Software controlled brightness

• Display with conﬁgurable time-out setting up to 180 minutes

• 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

• Variable power options, +5V or +7V to +15V or +7V to +30V

• Extended temperature option

• Fits Matrix Orbital’s dual PC Bay inserts without modiﬁcations

• Built in large digits

1.1 What to Expect From the VK204-25

The VK204-25 is designed as the display unit for an associated controller. The controller may be any-

thing 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 VK204-25

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

C port to the associated controller. Note that the keypad is not used to directly control

any aspect of the operation of the display, which acts simply as a matrix to serial converter. To use the

keypad to control the display, the controller must be programmed accordingly.

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