Industrial Electronic Engineers, Inc.
SIZE
A
CODE IDENT NO.
05464
S03875–21–0214
Van Nuys, California
SCALE N/A
REV A
SHEET 5
1.0
GENERAL INFORMATION
1.1
Introduction
This specification describes the serial interface Daystar Nova model 03875–21–0214, a 4–line supertwisted
liquid crystal display (LCD) with 40 characters per line.
Model Number Designation System
03875
–
21
–
0
2
1
4
Transflective STN
LCD w/EL Backlight
4x40 Format
Reserved
1 =
Parallel Data Input
*
2 = Serial Data Input
1 = +5 V
DC
Backlight Power
4 = White
Color
* Parallel standard, Serial optional
1.2
Application
Daystar Nova modules provide alphanumeric information which is easily readable in high ambient light or in
darkness with optional backlight. The low power requirements of the modules make them suitable for portable
battery operated equipment. The wide operating temperature range (–30° to +80°C) is ideal for most outdoor
applications. The choice of a preferential viewing hemisphere is not necessary because of the excellent wide
angle viewing characteristics of the new Super Bi–refringent Effect (SBE) liquid crystal cell used in this display.
The serial data input model of the 03875–21 Daystar Nova display allows communication between a host
processor and the display by means of a serial RS–232C interface. This provides the capability to
communicate over a longer distance than is possible with the parallel model. The RS–232 interface is a two
wire communication link.
1.3
Standard Features
•
Serial data communication via RS–232C
•
Multiple baud rates: 1200, 2400, 4800, and 9600
•
Low power consumption
•
Wide temperature range
•
Built–in diagnostics
•
Down–loadable special characters
1.4
Description
The serial input Daystar Nova module includes an on–board CMOS microprocessor which translates serial
data into parallel data and provides other enhancements over the parallel model. The serial data may be set by
a jumper to accommodate speeds of 1200, 2400, 4800, and 9600 baud. Parity may also be set by jumper for
odd, even, or no parity. The electrical interface is RS–232C compatible.
A 5 Volt nominal power supply is required for operation. The unit operates from 4.50 Volts to 5.50 Volts.
The typical power requirement for the module is 120mW.
The module weighs 9.1 ounces (257.7 grams).
2.0
LOGICAL STRUCTURE AND FUNCTION
2.1
Module Block Diagram
Figure 1 illustrates the major components of the serial option Daystar Nova module. The module provides
means for an external viewing angle adjustment potentiometer (V
BIAS
Adj.) at Pin 4, and connections for optional
RESET and self–test switches at Pins 3 and 5. The external viewing angle adjustment potentiometer should be
connected to the same +5 Volt supply as the display module. RESET and TEST pull down to ground to
activate the function. All three inputs may be left open if not used. The V
BIAS
test point is used at the factory to
