Matrix-orbital LCD/VFD Legacy Manual de usuario descargar pdf (Pagina 4)

1 Introduction

The LCD4041 comes equipped with the following features;

• 40 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 (with software controlled speed)

• Use of up to 127 modules on the same 2-wire I

C interface

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

• Ability to add customized splash / start up screen

• Software controlled contrast

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

• One general purpose output for a variety of applications

• Horizontal or vertical bar graphs

• Variable power options, +5V or +7V to +35V

• Extended temperature option

1.1 What to Expect From the LCD4041

The LCD4041 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 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. A general purpose output allows the controller to switch

an electro-mechanical device by issuing commands to the display unit. These can be used for controlling

LEDs, relays, etc.

1.2 What Not to Expect From the LCD4041

The display does not include bitmap graphics capability, except that permitted by deﬁning special char-

acters. The display does not have a keypad interface.

1.3 Setup for Testing

Before setting up the application the user may want to try out the display. This is easily done with a PC.

If not equipped with a dual bay PC mounting kit, the following will be required;

• A 4-pin power connector of the type used to connect 3.5" ﬂoppy drive. Take care not to connect the

display to an unmodiﬁed spare power connector in a PC

• A 5V power supply

• A PC with a spare RS-232 port (COM1 or COM2)

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