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Remote Operation
Using Commands
4
4-13
Using Commands
Communications between the controller and the Calibrator consists of commands,
queries, and interface messages. Although the commands are based on the 488.2
standard, they can be used on either the IEEE-488 or RS-232 interface, except for
a few specialized RS-232 commands described in “Commands for RS-232 Only.”
For more information on command structures, see the IEEE 488.2 standard.
Refer to Chapter 5, “Remote Commands” when you require additional information
about command references used this chapter.
All commands and units may be entered in UPPER or lower case.
There are two remote control configurations that use commands, queries, and
interface messages: IEEE-488 and RS-232 mode. Setting up and testing each mode
is discussed earlier in this chapter.
IEEE-488 Mode The IEEE-488 mode is used when the Calibrator is operated by
computer program. In this mode, requested information is returned by query, and
interface messages are queued and returned by command.
RS-232 Mode The RS-232 mode is used when the Calibrator is operated by
terminal or computer program. In this mode, requested information is returned by
query, and interface messages are queued and returned by command.
Types of Commands
The commands for the Calibrator can be grouped into one or more categories,
depending on how they function. Each category is described below.
Device-Dependent Commands
Device-dependent commands are unique to the Calibrator. An example of a
device-dependent command is,
OUT 1 V
instructing the Calibrator to source 1 volt dc.
Common Commands
Common commands are defined by the IEEE 488.2 standard and are common to
most bus devices. Common commands always begin with an * character. Common
commands are available whether you are using the IEEE-488 or RS-232 interface
for remote control. An example of a common command is,
*IDN?
instructing the Calibrator to return the instrument identification string.
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