If you are planning to do any serious programming with serial communications, I suggest you purchase a copy of this book. Instead of just a narrative, this book contains as key charts, C code, and X modem information, informational and classical C R C circuits, frequency modulation, scratch pads, terminal information, R S 32 intimation, and on, and on, and on.
It includes an ASCII poster. I have tried mounted my copy of the ASCII poster and placed on Wall above the CRT. The people where I took it to be dry mounted asked me if this was an eye chart.
The Bullets on the back cover include: The ASCII character set and cover extension techniques.
The fundamentals of a synchronous technology: baud rate, START and STOP bits, and more.
Error-checking methods including a landmark treatment of C R C's.
Flow-control and file-transfer protocols.
Modems: theory and practice.
The rs-232interface from the programmer's point of view.
Intelligent modems, including the entire Hayes smart modem family.
UART's: a detailed examination of two popular products the 8250 and the deceit Z80SIO.
This book is 655 pages long and there is not one wasted.