RS232 To TTL User Guide.pdf

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Advanced Data Capture and Control Systems
Tronisoft Limited
Email: sales@tronisoft.com
Web: www.tronisoft.com
RS232 To TTL User Guide
RS232 to 5V TTL Signal Converter Modules
P/N: 9650
Document version: 1.01
Date: February 2008
Information furnished is believed to be accurate and reliable. However, Tronisoft Limited assumes no responsibility,
consequential or otherwise of use of such information.
Email support@tronisoft.com with suggestions or to report document inaccuracies, omissions and errors.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and
replaces all information previously supplied.
© Copyright 2008 Tronisoft Limited - Printed in England, United Kingdom - All Rights Reserved.
http://www.tronisoft.com
RS232 To TTL User Guide
1
IMPORTANT INFORMATION, NOTICES AND ACKNOWLEDGEMENTS .......................... 2
1.1
1.2
1.3
1.4
1.5
2
2.1
2.2
3
3.1
3.2
3.3
3.4
3.5
4
T
RADEMARKS
.................................................................................................................... 2
D
ISCLAIMER
....................................................................................................................... 2
S
AFETY AND
R
EGULATORY
C
OMPLIANCE
............................................................................. 2
R
O
HS C
OMPLIANCE
........................................................................................................... 2
D
OCUMENT
R
EVISION
......................................................................................................... 2
F
EATURES
L
IST
.................................................................................................................. 3
B
LOCK
D
IAGRAM
– RS232 T
O
TTL M
ODULE
....................................................................... 4
P
OWER
S
UPPLY
................................................................................................................. 5
D
IGITAL
5V TTL C
ONNECTION
............................................................................................ 5
RS232 P
ORT
(9
PIN
D
FEMALE
) .......................................................................................... 6
S
TATUS
LED
S
................................................................................................................... 7
M
ODULE
S
PECIFICATION
.................................................................................................... 7
INTRODUCTION .................................................................................................................... 3
HARDWARE DESCRIPTION ................................................................................................. 4
QUICK START – DEMONSTRATION ................................................................................... 8
APPENDIX A – PINOUT AND SIGNALS FOR THE PC RS232 CONNECTOR .......................... 9
RS232_To_TTL_Converter.doc, © Copyright 2008 Tronisoft Limited. All Rights Reserved.
1
RS232 To TTL User Guide
1 Important Information, Notices and Acknowledgements
No parts of this work may be reproduced in any form or by any means - graphic, electronic, or
mechanical, including photocopying, recording, taping, or information storage and retrieval
systems without the written permission of the publisher and author. All rights reserved.
1.1
Trademarks
Products that are referred to in this document may be either trademarks and/or registered
trademarks of the respective owners. The publisher and the author make no claim to these
trademarks.
1.2
Disclaimer
Information furnished is believed to be accurate and reliable. However, the publisher and the
author assume no responsibility, consequential or otherwise, for errors or omissions or use of
such information contained in this document or from the use of programs and source code that
may accompany it. In no event shall the publisher and the author be liable for any loss of profit
or any other commercial damage caused or alleged to have been caused directly or indirectly by
this document.
1.3
Safety and Regulatory Compliance
Tronisoft Limited takes considerable care in designing products with safety and ease of use in
mind. However, Tronisoft’s products are not authorized for use as critical components in life
support or safety critical devices or systems. The product(s) contained within this User Guide are
OEM products. These may be suitable only for system integrators and electronics enthusiasts.
By using, testing or integrating the product(s) described in this User Guide, you accept
responsibility for ensuring that relevant local regulatory compliancy requirements are met
depending on the country of use. Follow any recommendations and take note of any cautions or
warnings stated within this User Guide. Generally, do not use Tronisoft products without first
reading their respective User Guide.
1.4
RoHS Compliance
Tronisoft has taken reasonable steps within its supply chain to source components that are free
of lead and other environmentally hazardous parts and assures RoHS compliancy.
1.5
Version
V1.00
V1.01
Document Revision
Date
August 2007
February 2008
Summary of changes
First version.
Added descriptions for new options
RS232_To_TTL_Converter.doc, © Copyright 2008 Tronisoft Limited. All Rights Reserved.
2
RS232 To TTL User Guide
2 Introduction
The RS232 to TTL 5V Signal Converter Module is a professional module for projects requiring
PC/Laptop RS232 interface to 5V TTL logic. This module converts signals between RS232
voltage levels and TTL voltage levels. It is bi-directional, where TTL signals are converted to
RS232 levels and RS232 levels are converted to TTL levels. It is ideal for use in pc interfacing,
microcontroller based projects, robotics, or for experimental and educational purposes. This
document is applicable to the 4201, 4202 and 4203 versions of the modules. Table 1 highlights
the main differences.
Table 1:
RS232 to TTL (420X) Model Variations
Model
No.
4201
4202
4203
Built-in PSU
(5V regulator)
Yes
(Optional)
(Optional)
Signal Support
TX,RX,RTS,CTS
TX,RX,RTS,CTS
TX,RX.
Optional
RTS,CTS.
TTL Connector
6-pin 2.54mm
header (component
side)
6-pin 2.54mm
header
(PCB underside)
4-mini screw
terminals (2.54mm
pitch)
Status LEDs
Power and TX/RX logic.
Power.
Optional TX/RX logic.
Power.
Optional TX/RX logic.
2.1
·
·
·
·
·
·
·
·
·
Features List
High speed, replaceable MAX232 based. Device fitted supports upto 120kbps
Works with PCs or Laptops
Supports microcontroller UARTs – 5V TTL signal levels.
Single DC supply: wide input range for 4201 or 5V for 4202 and 4203
Small PCB footprint of 50´40mm
Low current status LED(s)
Very low power consumption
Optional on board PSU for internal/external use for quick start out of the box.
Power can be routed to pin 9 (if required) on RS232 connector – useful for specific
applications.
A brief list of some of the features is given below:
RS232_To_TTL_Converter.doc, © Copyright 2008 Tronisoft Limited. All Rights Reserved.
3
RS232 To TTL User Guide
2.2
Block Diagram – RS232 To TTL Module
The 4201 module has an optional 5V regulator circuitry fitted as default to provide regulated 5V
power to the module from a wide voltage range and is suitable for battery powered applications.
Model 4202 and 4203 require 5V to be applied via the TTL connection end.
See Figure 1 below. These modules have multiple connector options for the TTL logic level side.
Model 4201 features a 6-pin 2.54mm header interfaces. Model 4202 has the 6-pin header at the
underside of the board so that it may be used conveniently on “breadboard” or other such
prototype boards. Model 4203 has screw terminals for simple wiring interface for a very common
4-pin interface (power, ground, TX and RX).
Figure 1:
RS232 To TLL - Module Block Diagram
Module 420X
Optional PP3
Connector
Optional 5V Regulator
Power
LED
TTL (5V)
Logic
J3/J4
GND(-)
VCC(+)
RX(IN)
TX(OUT)
CTS(IN)
RTS(OUT)
Optional
TX/RX
LEDs
MAX232
Line
Driver IC
J1
DB-9F
RS232
Interface
RS232
All models feature a low current power status LED to indicate that the module is powered. There
are also additional status LEDs fitted as default on model 4201 that monitor at the TTL / logic
level state of the TX and RX lines (which will flash on communication).
3 Hardware Description
The RS232 to TTL modules have two main ports - the TTL and RS232 connection as described
below. Model 4201 however has an additional PP3 connector and on-board 5V regulator
circuitry for battery powered use. A typical connection is via a simple straight through serial
cable to a PC/laptop’s serial port:
Figure 2:
Host Connection
Serial extension cable
e.g. Tronisoft P/N: 3200
RS232_To_TTL_Converter.doc, © Copyright 2008 Tronisoft Limited. All Rights Reserved.
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