Controller Programs
G-2
IBM PC/XT/AT with Capital
Equipment Corporation PC<>488
Interface (Keithley PC-488-CEC)
Introduction
General information about controlling a Model 2001 with an
IBM PC/XT/AT computer and Capital Equipment Corpora-
tion PC<>488 interface is given here. Refer to the CEC
PC<>488 Programming and Reference Manual for complete
information.
Initializing the system
The first step in any program is to initialize the system using
the INITIALIZE routine. This routine sets the primary IEEE-
488 bus address of the PC<>488, specifies the type of con-
troller to be used, and sends an interface clear (IFC) to the
other devices on the bus.
After booting up the IBM using DOS and entering BASICA,
the statements of Program 1 can be used at the start of any
program to initialize the system.
Line 30 sets the address of the PC<>488 to 21, however, any
other valid address could be used as long as it does not con-
flict with the address of any other device on the bus.
Interface basic programming statements
This paragraph covers the PC<>488 statements that are es-
sential to Model 2001 operation. A partial list of program-
ming statements is contained in Table G-1. The IBM BASIC
CALL statement is used to execute the desired action. Before
a CALL routine can be used, BASIC needs to know the offset
address of the routine. In the table, the first statement of each
programming sequence defines the offset address of the
CALL routine.
Example program
The following program sends a command message from an
IBM PC/XT/AT computer to the Model 2001 and displays
the response to a query on the CRT. The computer must be
equipped with a CEC interface card and DOS 2.0 (or later re-
vision) operating system.
Directions
1. Using the front panel MENU key, set the primary IEEE-
488 address of the Model 2001 (GPIB selection) to 16.
2. With the power off, connect the Model 2001 to the
IEEE-488 interface card installed in the IBM computer.
3. Type in BASICA on the computer keyboard to get into
interpretive BASIC language.
4. Enter the lines of Program 2 using the return key after
each line.
5. Run the program and type in the desired command
string at the Enter Program Message prompt. For exam-
ple, to request a reading, type in :FETCh? and press the
RETURN key. The reading will appear on the computer
CRT.
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