Sony Ericsson RS232 interface for GT47 embedded apps UART Application Note Download Page 14

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RS232 interface for GT47 embedded apps UART

LZT 123 7698 R1B

GLOSSARY

Com Port Serial Communications Port

CTS

Clear To Send

DB9

Standard Density 9-pin ‘D’-type Sub-miniature Connector

DCD

Data Carrier Detect

DCE

Data Communicating Equipment

DSR

Data Set Ready

DTE

Data Terminating Equipment

DTR

Data Terminal Ready

GND

Power Supply Ground Connection

GSM

Global System for Mobile Communications

HD15

High Density 15-pin ‘D’-type Sub-miniature Connector

PCB

Printed Circuit Board

RD Receive

Data

RI Ring

Indicator

RTS

Request To Send

SMS

Short message Service

TD Transmit

Data

UART

Universal Asynchronous Receiver Transmitter

VDD

Power Supply Voltage Connection

Summary of Contents for RS232 interface for GT47 embedded apps UART

Page 1: ...Application Note RS232 interface for GT47 embedded apps UART ...

Page 2: ...n Mobile Communications reserves the right to make modifications additions and deletions to this manual due to typographical errors inaccurate information or improvements to programs and or equipment at any time and without notice Such changes will nevertheless be incorporated into new editions of this manual All rights reserved Sony Ericsson Mobile Communications 2004 ...

Page 3: ...s UART Contents 1 INTRODUCTION 4 2 DESIGN OVERVIEW 5 2 1 DESCRIPTION 5 2 2 3 WIRE RS232 7 2 3 5 WIRE RS232 7 2 4 DCE TO DCE NULL MODEM 7 2 5 SPARE CONNECTIONS 8 3 ASSEMBLY PARTS 9 APPENDIX A 10 APPENDIX B 11 GLOSSARY 14 LZT 123 7698 R1B 3 ...

Page 4: ... between a standard serial command interface compatible with RS232 PC modem communication and a configurable electrical interface which will meet a variety of interface requirements With the configurable interface the voltage is determined by the application Where the application demands a second RS232 interface from the GT47 s configurable I O it is necessary to provide the RS232 voltage levels e...

Page 5: ...ther end of the PCB has a DB9 socket with a DCE pin out The RS232 PCB uses a DCE pin out so it can be connected directly to a PC Com Port DTE using a 9 way straight through modem cable If the GT47 needs to communicate with another DCE device use a Null Modem cable between devices For a typical assembly solder each of the 7 flying leads onto the 7 solder terminals of the level shifter PCB When not ...

Page 6: ...ellow T4 Out CTS 8 14 Green T5 GND 5 11 Orang e T6 In RTS 7 15 Blue T7 In DCD 1 DTR 4 DSR 6 RI 9 DB9 signals DCD DTR and DSR pins 1 4 and 6 are internally shorted together to provide a hardware flow control loop back to the DTE Solder Terminal T7 is provided as a spare It is designated as a general purpose input to the GT47 when soldered to the blue flying lead of the developer s kit cable which c...

Page 7: ...nable flow control from the GT47 and add straps ST1 and ST2 see section 2 3 Figure 4 2 3 5 Wire RS232 In the 5 wire configuration surface mount strap resistors ST1 and ST2 must be mounted This requires soldering 0603 size zero ohm resistors into positions ST1 and ST2 as indicated in figure 3 Adding the surface mount resistors should be performed by a skilled technician and the PCB must first be di...

Page 8: ...e The cable provided in the developer s kit is a fixed 1 metre length with tinned copper flying leads In the event of the general purpose input wire length being too short an extension wire can be joined using the spare terminal hole in T7 Terminal T7 is not electrically connected to the RS232 PCB electronics so signals carried on it will not affect RS232 operation LZT 123 7698 R1B 8 ...

Page 9: ...t Description PCB RS232 Level Translator PCB P N 9188 P1B Sony Ericsson M2M Com R1 R2 1kΩ 0603 C1 C2 C3 C4 C5 100nF 0603 U1 SP3223EEY X1 DB9 Socket DCE ST1 ST2 0Ω link resistor 0603 not mounted Back Shell Plastic DB9 Hood strain relief and screws LZT 123 7698 R1B 9 ...

Page 10: ...RS232 interface for GT47 embedded apps UART APPENDIX A Figure 1 RS232 Converter Schematic LZT 123 7698 R1B 10 ...

Page 11: ...RS232 interface for GT47 embedded apps UART APPENDIX B Figure 2 PCB Top Side LZT 123 7698 R1B 11 ...

Page 12: ...RS232 interface for GT47 embedded apps UART Figure 3 PCB Bottom Side LZT 123 7698 R1B 12 ...

Page 13: ...RS232 interface for GT47 embedded apps UART Figure 4 RTS CTS Flow Control Loop back LZT 123 7698 R1B 13 ...

Page 14: ...ing Equipment DSR Data Set Ready DTE Data Terminating Equipment DTR Data Terminal Ready GND Power Supply Ground Connection GSM Global System for Mobile Communications HD15 High Density 15 pin D type Sub miniature Connector PCB Printed Circuit Board RD Receive Data RI Ring Indicator RTS Request To Send SMS Short message Service TD Transmit Data UART Universal Asynchronous Receiver Transmitter VDD P...

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