Table of Contents
Introduction.........................................................................................................................................................1
License.....................................................................................................................................................1
Organization.............................................................................................................................................1
Chapter 1, Basics of Serial Communications...................................................................................................3
What Are Serial Communications?.........................................................................................................3
What Is RS−232?.....................................................................................................................................4
Signal Definitions..............................................................................................................................4
Asynchronous Communications..............................................................................................................5
What Are Full Duplex and Half Duplex?..........................................................................................6
Flow Control......................................................................................................................................6
What Is a Break?...............................................................................................................................6
Synchronous Communications................................................................................................................7
Accessing Serial Ports..............................................................................................................................7
Serial Port Files.................................................................................................................................7
Opening a Serial Port........................................................................................................................7
Writing Data to the Port....................................................................................................................8
Reading Data from the Port...............................................................................................................9
Closing a Serial Port..........................................................................................................................9
Chapter 2, Configuring the Serial Port...........................................................................................................11
The POSIX Terminal Interface..............................................................................................................11
Control Options...............................................................................................................................12
Local Options..................................................................................................................................15
Input Options...................................................................................................................................16
Output Options................................................................................................................................18
Control Characters...........................................................................................................................19
Chapter 3, MODEM Communications...........................................................................................................21
What Is a MODEM?..............................................................................................................................21
Communicating With a MODEM..........................................................................................................21
Standard MODEM Commands.......................................................................................................23
Common MODEM Communication Problems...............................................................................23
Chapter 4, Advanced Serial Programming....................................................................................................25
Serial Port IOCTLs................................................................................................................................25
Getting the Control Signals.............................................................................................................26
Setting the Control Signals..............................................................................................................27
Getting the Number of Bytes Available..........................................................................................27
Selecting Input from a Serial Port..........................................................................................................28
The SELECT System Call...............................................................................................................28
Using the SELECT System Call.....................................................................................................28
Using SELECT with the X Intrinsics Library.................................................................................29
Appendix A, Pinouts.........................................................................................................................................31
RS−232 Pinouts.....................................................................................................................................32
RS−422 Pinouts.....................................................................................................................................33
RS−574 (IBM PC/AT) Pinouts..............................................................................................................33
SGI Pinouts............................................................................................................................................34
Appendix B, ASCII Control Codes.................................................................................................................35
Control Codes........................................................................................................................................35
Serial Programming Guide for POSIX Operating Systems
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2008-07-10
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drinkingcode2015-04-04谢谢楼主的分享,对于Linux下的串口还是很有帮助的
qilu08822014-09-17非常经典的资料，谢谢分享
hutpond2013-04-11对串口编程很有帮助。
