C-2
IBM PC/XT/AT with Capital
Equipment Corporation
PC<>488 Interface (Keithley
PC-488-CEC)
Introduction
General information about controlling a Model 7001
with an IBM PC/XT/AT computer and Capital Equip-
ment Corporation PC<>488 interface is given here. Re-
fer to the CEC PC<>488 Programming and Reference
Manual for complete information.
Initializing the system
The Þrst 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, speci-
Þes the type of controller to be used, and sends an in-
terface clear (IFC) to the other devices on the bus.
After booting up the IBM using DOS and entering BA-
SICA, 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 conßict with the address of any other device on the
bus.
Interface basic programming statements
This paragraph covers the PC<>488 statements that are
essential to Model 7001 operation. A partial list of pro-
gramming statements is contained in Table E-1. The
IBM BASIC CALL statement is used to execute the de-
sired action. Before a CALL routine can be used, BASIC
needs to know the offset address of the routine. In the
table, the Þrst statement of each programming se-
quence deÞnes 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 7001
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 revision) operating system.
Directions
1. Using the front panel MENU key, set the primary
IEEE-488 address of the Model 7001 (GPIB selec-
tion) to 7.
2. With the power off, connect the Model 7001 to the
IEEE-488 interface card installed in the IBM com-
puter.
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 com-
mand string at the ENTER COMMAND MES-
SAGE prompt. For example, to request the
currently deÞned Scan List, type in :SCAN? and
press the return key. The Scan List will appear on
the computer CRT.
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Summary of Contents for 7001
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