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

3 Common Device Control Functions

This chapter describes some of the more common ways that intrinsics

can be used to control asynchronous devices and includes sample code

segments to demonstrate these uses. The segments are coded in

Pascal/iX, but should be helpful regardless of the language you are

using. While details of declaring and calling intrinsics vary between

languages, the principles of their application do not. For more

information on using intrinsics with FORTRAN 77/iX or COBOL II/iX

you should see the MPE/iX Intrinsics Reference Manual as well as the

reference manual for the individual language.

The following device control functions are described in this chapter:

• Setting up access to a ﬁle and deﬁning its characteristics through

FOPEN.

• Reading from an asynchronous device using FREAD.

• Writing to an asynchronous device using FWRITE.

• Manipulating device settings through FCONTROL calls.

• Closing deviceﬁles using FCLOSE.