Manual

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User’s Manual

Scott Edwards Electronics, Inc.

1939 S. Frontage Road, Suite F, Sierra Vista, AZ 85635 USA

ph: 520-459-4802 • fax: 520-459-0623 • www.seetron.com

BPP-420 • v4.0 • 2/03 • pg 1

4x20 Serial LCD Module (BPP-420) v4.0

The BPP-420 is an LCD module with attached serial interface. This combination works like a simple

serial-receive terminal at 2400 or 9600 baud (switch selectable). Common control codes like carriage

returns, linefeeds, tabs, backspace, etc. are supported. The display also implements instructions for

cursor positioning, backlight control, large-character display, and right-aligned printing.

New Features in Rev 4.0. This latest version of BPP-420 has the following new features:

• Ability to redefine custom, block-graphics characters.

• Jumper pads to increase backlight brightness or set backlight always on.

• 64-byte buffer, large alpha (A-Z) characters, right-alignment (introduced in rev 3.0)

The revision is identified by “BPP4/PT” printed in the lower right portion of the serial daughterboard.

Disclaimer of Liability

Scott Edwards Electronics, Inc. is not responsible for any special, incidental, or consequential damages resulting

from any breach of warranty, or under any legal theory, including lost profits, downtime, goodwill, damage to or

replacement of equipment or property, and any costs or recovering, reprogramming, or reproducing of data

associated with the use of the hardware or software described herein.

Warranty

Scott Edwards Electronics, Inc. warrants this product against defects in materials and workmanship for a period

of 90 days. If you discover a defect, we will, at our option, repair, replace, or refund the purchase price. Return

the product with a description of the problem. We will return your product or its replacement via standard shipping.

Expedited shipping is available at the customer’s expense.

• Note: Abusing the module, or attempting to repair or modify it, voids this warranty.

Trademarks and Copyrights

Windows

and MS-DOS

are registered trademarks of Microsoft Corporation; BASIC Stamp

is a registered

trademark of Parallax Inc. All trademarked names referenced herein are the property of their respective holders.

This manual in its entirety is copyright Scott Edwards Electronics, Inc., 1995—1999.

Pinout of the BPP-420...............................................................................................................2

Configuration.............................................................................................................................2

Hookup for Use .........................................................................................................................2

Pizeo Buzzer Bell......................................................................................................................3

Backlight Option Pads...............................................................................................................3

Basic Operation.........................................................................................................................3

Control Codes and Special Features ........................................................................................3

Old-Mode Operation..................................................................................................................3

Program Examples....................................................................................................................7

Dimensions and Specifications .................................................................................................8

Important Notes on Handling, Installation, and Mounting ............................................... 10

Table of Contents

Summary of content (10 pages)

PAGE 1
User’s Manual BPP-420 • v4.0 • 2/03 • pg 1 4x20 Serial LCD Module (BPP-420) v4.0 The BPP-420 is an LCD module with attached serial interface. This combination works like a simple serial-receive terminal at 2400 or 9600 baud (switch selectable). Common control codes like carriage returns, linefeeds, tabs, backspace, etc. are supported. The display also implements instructions for cursor positioning, backlight control, large-character display, and right-aligned printing. New Features in Rev 4.0.
PAGE 2
User’s Manual BPP-420 • v4.0 • 2/03 • pg 2 Pinout of the BPP-420 Connections to the BPP-420 are made through a 5-pin header on the serial interface daughterboard, as shown in figure 1 below. Note that the photo is upside down with respect to the LCD. This was done in order to show the labels on the circuit board rightside-up. (The same board is used with 4x40 LCDs, where the labels match the LCD orientation.
PAGE 3
User’s Manual BPP-420 • v4.0 • 2/03 • pg 3 PC Serial (comm) Port BASIC Stamps Stamp J1 DB-9 female (solder side) 1 2 3 4 7 SER GND (Vss) GND +5V (Vdd) GND 5 +5 6 J1 8 I/O pin 0 +5 9 +5 SER power supply Figure 2. Connecting to PC serial port, BASIC Stamps. Piezo Buzzer “Bell” As figure 1 shows, you can connect a piezo buzzer to the BPP-420. The buzzer will beep when the ASCII bell character (cntl-G) is received.
PAGE 4
User’s Manual BPP-420 • v4.0 • 2/03 • pg 4 Control Codes and Special Feaures Table 1 lists the BPP-420 control codes. To send control codes from a terminal program, hold down Control and press another key. For example, to send cntl-E (underline cursor) hold down Control and press E. To send control codes from a program, send the ASCII value as a single byte (not as a text representation of the number). Using cntl-E as an example, send a single byte containing the value 5 (00000101 binary).
PAGE 5
User’s Manual BPP-420 • v4.0 • 2/03 • pg 5 Hide Cursor (control-D, ASCII 4) Hide the cursor (either type, blinking or underline). Show Underline Cursor (control-E, ASCII 5) Show a non-blinking underline cursor at the printing location. Show Blinking-Block Cursor (control-F, ASCII 6) Show a blinking block cursor at the printing location. Bell (control-G, ASCII 7) Pulse J4 for approximately 100 ms to beep piezo buzzer.
PAGE 6
User’s Manual BPP-420 • v4.0 • 2/03 • pg 6 Right-align Text (control-R, ASCII 18) Accept a number from 2 to 9 (as text) representing the width of an area on the screen in which rightaligned text is to be printed. Cursor will back up that number of characters from present cursor position. Subsequent text will be stored without printing to the screen until one of the following is received: • The specified number of characters. • A control character (ASCII 1–31). • A decimal point [the period (.
PAGE 7
User’s Manual BPP-420 • v4.0 • 2/03 • pg 7 Program Examples Any computer/programming language that can produce serial output (2400 or 9600 bps, N81) can talk to the BPP-420. The examples here are in BASIC, chosen because of its popularity and readability. You may download these and other program listings from www.seetron.com. ' ' ' ' ' ' Program: 420DEMO.
PAGE 8
User’s Manual BPP-420 • v4.0 • 2/03 • pg 8 Program Examples (cont.) ' ' ' ' ' ' Program: 420DEMO.BS2 (Demonstrate 4x20 Serial LCD with Stamp II) This program demonstrates many of the features of the 4x20 Serial LCD Module from Scott Edwards Electronics. Set the module to 9600 bps (S1: switch 1 down; 2 up). Connect the serial input of the module to BS2 pin P0, GND to GND and +5V to +5V. Run this program. ' =========Define names for LCD instructions, bps======= noCurs con 4 ' Make cursor invisible.
PAGE 9
User’s Manual BPP-420 • v4.0 • 2/03 • pg 9 Program Examples (cont.) ' Program: Q420DEMO.BAS (QBASIC Demo of 4x20 Serial LCD) ' This program demonstrates the 4x20 Serial LCD Module from Scott ' Edwards Electronics, Inc. with QBASIC. This program requires ' slight modifications to run under PowerBASIC or First BASIC, ' available from www.powerbasic.com. A modified version is ' available for download from www.seetron.com/bpk_ex1.zip.
PAGE 10
User’s Manual BPP-420 • v4.0 • 2/03 • pg 10 Dimensions and Specifications Current BPP-420L models use LCDs manufactured by Powertip; older models were made by Truly. The sole significant difference is in dimension L, the y dimension of the screen frame.