IEE SLB325-X4X0 Manuale utente
APPLICATION REVISIONS
NEXT ASSY FINAL ASSY LTR DESCRIPTION DATE APPROVED
-PRODUCTION RELEASE/E.O. 32986 7-1-97 D. Goodale
AE.O. 33084 9-19-97 D. Goodale
BE.O. 35402 6-29-00 D. Goodale
LIQUID CRYSTAL DISPLAY
4 X 20 CHARACTER
5x8 DOT MATRIX
WITH FIBER OPTIC BACKLIGHT
MODEL SLB325-X4X0
REV B-----B-------------A
SHEET 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
REVISION STATUS
PROJ. NO. 368 CONTRACT INDUSTRIAL ELECTRONIC ENGINEERS, INC.
VAN NUYS, CALIFORNIA
LIQUID CRYSTAL DISPLAY
DRAWN R. January 6/24/97 4 X 20 CHARACTER
CHECK WITH FIBER OPTIC BACKLIGHT (11-29V)
NOTICE IS HEREBY GIVEN THAT THIS DRAWING IS PART
OF A PROPRIETARY ITEM OWNED BY INDUSTRIAL APPROVED SIZE CODE IDENT NO.
ELECTRONIC ENGINEERS, INC. AND SHALL NOT BE
REPRODUCED, OR COPIED OR USED AS THE BASIS FOR
MANUFACTURE OR SALE OF APPARATUS WITHOUT
D. Goodale 7-1-97 A05464 SLB325-X4X0
WRITTEN PERMISSION OF I.E.E. INC. APPROVED SCALE N/A SHEET 1OF 21
Industrial Electronic Engineers, Inc. SIZE
ACODE IDENT NO.
05464 SLB325-X4X0
Van Nuys, California SCALE N/A REV BSHEET 2
05/23/02
TABLE OF CONTENTS
PARAGRAPH NUMBER & TITLE
1.0 GENERAL DESCRIPTION
1.1 Introduction
1.2 Application
1.3 Special Features
1.4 Description
2.0 BLOCK DIAGRAM
3.0 THEORY OF OPERATION
4.0 OPERATION
4.1 Loading ASCII Character Data
4.2 Control Codes
4.3 Character Chart
4.4 User Defined Characters
4.5 Dedicated Hardware Lines
4.6 Serial Data and Self-test
4.7 Connector Pin Assignments
5.0 ELECTRICAL CHARACTERISTICS
5.1 Power ON / OFF Sequence
5.2 Interface Signals
5.3 Absolute Maximum Ratings
5.4 Normal Operating Ratings
6.0 OPTICAL CHARACTERISTICS
7.0 ENVIRONMENTAL CHARACTERISTICS
8.0 FIBER OPTIC BACKLIGHT
9.0 ACCESSORIES
10.0 OUTLINE DRAWING
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Van Nuys, California SCALE N/A REV BSHEET 3
05/23/02
1.0 GENERAL DESCRIPTION
1.1 Introduction
This specification describes the interface requirements and features of a 4 line supertwist Liquid Crystal
Display (LCD) with 20 characters per line and a fiber optic (FO) backlight. The characters are formed using a
5x8 dot matrix.
1.2 Application
This unit may be used as a console display which provides alphanumeric information that is easily readable in
high ambient light or with the backlight, in low light conditions. It is ideal for point-of-sale terminals, office
computers, and a wide range of business and industrial equipment.
1.3 Special Features
Minimum depth 8 User defined characters
Power and data on same connector ASCII + 6 additional character sets
11-29 VDC operation EIA-232C or EIA-422A data interface
Low cost Software selectable blink
Shielded I/O and Connector Software self test
Wide operating temperatures (-20 to +70°)
1.4 Description
This LCD module is a self-contained multiplexed display which provides a simple serial interface to a
microprocessor system.
The display is available with one I/O connector and a choice of EIA-232C or EIA-422A interfacing.
The SBE liquid crystal cell used in this display has a golden-green background with dark blue-black
characters.
This unit consists of a liquid crystal display tube and a minimal amount of electronic hardware. All display
characters and control codes can be accessed in a 8-bit format. Primary complexity is contained within the
microprocessor software, which controls all display functions. Temperature compensation circuitry is provided
to insure that viewing characteristics are optimized for all temperatures.
A fiber optic backlight illuminated by two ultra-bright yellow LEDs is mounted behind the LCD to allow for low
light level operation. Note that the display background remains golden-green. Backlight power is controlled
by two software control codes
A single 5VDC ±5% power supply is required for operation. At 12.0VDC, total power is approximately .70
watts and current is about 58mA without the backlight, and 100mA with the backlight ON.
Data is entered serially at 9600 Baud at rates determined by execution times.
The large characters are easily readable, even in direct sunlight and provide comfortable short or long-term
viewing.
Figures 3 through 10 depict character sets used in this module.
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2.0 BLOCK DIAGRAM
LEVEL CONVERTERS
LCD CELL
ROW DRIVER
SHIFT REGISTER
SHIFT REGISTER
DEDICATED
ON-BOARD
MICROPROCESSOR
CONTROLLER
ON-BOARD
DC-TO-DC
VOLTAGE
CONVERTER
FOR LIQUID CRYSTAL
DISPLAY CELL
DRIVE VOLTAGES
DTR
CTS
TX
RX
EIA-232
RETURN
RX -
RX +
TX +
TX -
OR
EIA-422
11-29VDC
LEVEL CONVERTERS
COLUMN
LED ILLUMINATED
FO BACKLIGHT
FIGURE 1
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3.0 THEORY OF OPERATION
Liquid Crystal Displays utilize ambient light falling on the display to reflect the image to the observer. The
LCD cell is constructed by sandwiching a liquid crystal mixture between two glass plates that are coated with
a polarizer, and lined with transparent electrodes. A selectively applied electric field aligns the nematic
molecules (crystals) so that they either transmit or block the polarized light from being reflected back out of
the cell to the viewer.
This display consists of two display areas, each comprising a matrix of 18 x 120 dots, to display two lines of
characters. A matrix addressing technique provides individual control of the electric field applied to each dot
used to create the character. The reflected light appears as a yellow-green background, and the light is
blocked to create the dark blue characters. The 18 high dot columns allow for creation of special characters
and fonts. Liquid crystal displays have several advantages over other display technologies. LCDs operate
from low voltage and power, are viewable in direct sunlight, have long life, and are more economical to
manufacture.
FIGURE 2
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4.0 OPERATION
4.1 Loading ASCII Character Data
All printing characters are located in standard ASCII code locations from 20 (HEX) to FF (HEX). Control
character assignments are as follows.
4.2 Control Codes
NOTE: CARE SHOULD BE TAKEN NOT TO SEND UNDEFINED CONTROL OR COMMAND CODES TO
THE DISPLAY MODULE AS THIS MAY CAUSE A SOFTWARE MALFUNCTION OF THE MODULE.
4.2.1 Instruction
DATA (HEX) DESCRIPTION
01 READING THE CHARACTER CAPACITY OF THE DISPLAY (DISPLAY RESPONDS
SENDING 50 (HEX))
02 DISPLAY SOFTWARE CHECKSUM AND SOFTWARE NUMBER
03 READ CURSOR LOCATION VALUE
(DISPLAY RESPONDS WITH 1 BYTE)
FOR 5X8 DOT CHARACTERS FOR 10X14 DOT CHARACTERS
01-14 (HEX) FOR LINE 1
21-34 (HEX) FOR LINE 2
41-54 (HEX) FOR LINE 3
61-74 (HEX) FOR LINE 4
01-0A (HEX) FOR LINE 1
21-2A (HEX) FOR LINE 2
04 READ DATA AT PRESENT CURSOR LOCATION
05 05-C-L-D GRAPH MODE: DISPLAY 8 PIXEL DATA D ON LINE L COLUMN C
C = 01-0F (HEX) (15 columns, each 8 pixels wide = 120 pixels)
L = 01-24 (HEX) (36 pixel lines)
D = 8 PIXEL DATA
example: 05-01-01-A3: turn on 1st, 3rd, 7th and 8th pixel from upper left corner
06 BEGIN BLINK FIELD AT CURRENT CURSOR LOCATION
07 END BLINK FIELD AT CURRENT CURSOR LOCATION
08 BACKSPACE CURSOR LOCATION ONE POSITION (cursor stays when at HOME location)
09 ADVANCE CURSOR LOCATION ONE POSITION (cursor wraps around after bottom right
character location)
0A LINE FEED (vertical scroll from bottom line; cursor position does not change)
0C CLEAR THE DISPLAY (cursor stays)
0D CARRIAGE RETURN (returns cursor to left-most character position of the same line;
does not clear display)
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4.2.1 Instruction (Cont’d)
DATA (HEX) DESCRIPTION
0E MAKE CURSOR INDICATOR INVISIBLE (the cursor location counter continues to function
but there is no visible indicator of next character location)
0F + MAKE CURSOR INDICATOR VISIBLE, FLASHING BLOCK.
<10> BOTTOM LINE DATA ENTRY WITH AUTOMATIC CARRIAGE RETURN & LINE FEED
(puts cursor a left side bottom row and data enters beginning at the left-most character
position of the bottom row, vertical scroll from bottom line after line has been filled)
<11> + NORMAL DATA ENTRY WITH AUTOMATIC CARRIAGE RETURN AND LINE FEED
(data enters beginning at the home position, vertical scroll from bottom line after line
has been filled)
<12> OVERWRITE OF RIGHT-MOST CHARACTER ON THE PRESENT LINE/AUTOMATIC
CARRIAGE RETURN OFF
<13> HORIZONTAL SCROLL MODE (from right to left on bottom line only, after line has been
filled)
14 RESET (go to system default settings and clear all DOWN LOAD CHARACTERS)
15 + DISPLAY CLEAR (puts cursor at left side bottom row in Mode 10 HEX, & home in Modes
11 HEX, 12 HEX, 13 HEX and 1A HEX)
16 + CURSOR HOME (returns cursor to upper left-most position)
17 BACKLIGHT ON
18 + BACKLIGHT OFF (Blinks ON momentarily during power-up)
19 SET BIT 7 HIGH FOR NEXT BYTE ONLY:
19-00 TO 19-7F: Same as ASCII 80-FF
<1A> WRAP AROUND DATA ENTRY:
(After bottom right character enters, cursor moves to home position)
1B 1B-05-49 IEE SPECIFIC RESPONSE CODE
(Sent without regard for flow control)
D,2,IEE,35964,-03 (CR) (18 BYTES)
1B-26-01-M-N DEFINE DOWN LOAD CHARACTERS (5x8 DOT CHARACTER ONLY)
M=BYTE LOCATION TO BEGIN DOWNLOAD (20 to FF)
N=NUMBER OF CHARACTERS TO BE DOWNLOADED
EACH CHARACTER PATTERN IS 5 BYTES (See 4.4)
1B-3F-N DELETE DOWNLOAD CHARACTER LOCATION N (N=20-FF)
1B-40 TERMINATE SELF TEST (all configurations go to default setting
and clear all DOWN LOAD CHARACTERS)
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4.2.1 Instruction (Cont’d)
DATA (HEX) DESCRIPTION
1B-74-N SELECT CHARACTER SET
+ N=01, ASCII AND GENERAL EUROPEAN (fig. 3 & 4)
N=03, ASCII AND CYRILLIC (fig. 5)
N=02, ASCII AND KATAKANA (fig. 6)
N=04, ASCII AND HEBREW (fig. 7)
N=05, ASCII AND GREEK (fig. 8)
N=06, ASCII AND POLISH (fig. 9)
N=07, BOLD FONT (fig. 10)
1D-05 EPSON SPECIFIC RESPONSE CODE DISPLAY RESPONDS
SENDING 05 TO HOST.
1F 1F-24-C-L MOVE CURSOR TO COLUMN C LINE L
FOR 5X8 DOT CHARACTERS: C=01-14 (HEX)
L=01-04 (HEX)
FOR 10X14 DOT CHARACTERS: C=01-0A (HEX)
L=01-02 (HEX)
1F-40 EXECUTE SELF TEST (Use 1B-40 to terminate self test)
1F-45-T SET ALL DISPLAY BLINK FIELDS AT INTERVAL T
T x 50 msec, 50% DUTY CYCLE
Tmax = 3F (HEX)
20 to 7F MAIN CHARACTER SET
80 to F7 ALTERNATE CHARACTER SET
+ Display automatically defaults to these conditions after power-up or reset.
< > These instructions are mutually exclusive
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4.3 Character Chart (5x8 Dot Matrix)
The LB325-X4X0 module offers seven independently-selectable Character sets. Six consist of the ASCII set
shown below in Fig 3 occupying hex 20 through hex 7F, plus either General European (fig 4), Cyrillic (fig 5),
Katakana (fig 6), Hebrew (fig 7), Greek (fig 8), or Polish (fig 9). These “special” portions of the character field
occupy all or portions of hex 80 through hex F4 as shown. The seventh set consists of Bold characters (fig
10) occupying hex 20 through hex 5F.
FIGURE 3 - ASCII CHARACTER SET
Note: N/A = Non-Applicable
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4.3 Character Chart (5x8 Dot Matrix) (Continued)
FIGURE 4 - GENERAL EUROPEAN CHARACTER SET
(Default Setting)
Note: N/A = Non-Applicable
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