Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

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Guide to This Manual
This manual is divided into the following chapters and appendices:
• Chapter 1, “Introduction,” introduces Asynchronous Serial
Communications (ASC) and the organization of the hardware and
software used by the Distributed Terminal Subsystem (DTS).
Includes a review of basic data communications concepts relevant to
asynchronous devices connected to HP 3000 Series 900 computer
systems.
• Chapter 2, “Controlling Asynchronous Devices Programmatically,”
summarizes the programmatic control of asynchronous devices.
Provides an overview of the file system and device operation, along
with a general description of using intrinsics in a program.
• Chapter 3, “Common Device Control Functions,” contains additional
information needed to use intrinsics successfully in a user program,
and provides code samples to demonstrate how intrinsics can be
used to perform some basic device control functions.
• Chapter 4, “Using FDEVICECONTROL,” provides information on
how the FDEVICECONTROL intrinsic may be used to perform
terminal control functions. Code fragments demonstrate several of
the functions performed by this intrinsic.
• Chapter 5, “Using Subsystem Break,” explains the use of subsystem
break and summarizes the intrinsics involved. Includes example
code illustrating a subsystem break handler and a procedure to
enable subsystem break.