Table of Contents
Introduction.........................................................................................................................................................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?.........................................................................................................................7
Synchronous Communications................................................................................................................7
Accessing Serial Ports..............................................................................................................................7
Serial Port Files...........................................................................................................................7
Opening a Serial Port..................................................................................................................8
Writing Data to the Port..............................................................................................................9
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..........................................................................................................................17
Control Characters....................................................................................................................18
Chapter 3, MODEM Communications...........................................................................................................21
What Is a MODEM?..............................................................................................................................21
Communicating With a MODEM..........................................................................................................21
Standard MODEM Commands.................................................................................................22
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..........................................................................................................27
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.....................................................................................................................................31
RS−422 Pinouts.....................................................................................................................................32
RS−574 (IBM PC/AT) Pinouts..............................................................................................................32
SGI Pinouts............................................................................................................................................33
Serial Programming Guide for POSIX Operating Systems
Introduction i
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