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15-6 Common Commands

*TRG programming example

The command sequence in Table 15-4 conﬁgures the SourceMeter to be controlled by bus

triggers. The last command, which sends a bus trigger, triggers one measurement. Each subse-

quent bus trigger will also trigger a single measurement.

NOTE With :ARM:SOURce BUS selected, do not send any commands (except *TRG, GET,

DCL, SDC, IFC, and ABORt) while performing source-measure operations. Other-

wise, erratic operation will occur.

*TST? — self-test query Run self test and read result

Use this query command to perform a checksum test on ROM. The command places the

coded result (0 or 1) in the Output Queue. When the SourceMeter is addressed to talk, the

coded result is sent from the Output Queue to the computer.

A returned value of zero (0) indicates that the test passed, and a value of one (1) indicates

that the test failed.

*WAI — wait-to-continue Wait until previous commands are completed

Effectively, the *WAI command is a No-Op (no operation) for the SourceMeter and thus,

does not need to be used.

Two types of device commands exist:

• Sequential commands — A command whose operations are allowed to ﬁnish before the

next command is executed.

• Overlapped commands — A command that allows the execution of subsequent com-

mands while device operations of the Overlapped command are still in progress.

The *WAI command is used to suspend the execution of subsequent commands until the

device operations of all previous Overlapped commands are ﬁnished. The *WAI command is

not needed for Sequential commands.

Table 15-4

*TRG programming example

Command Description

*RST

:ARM:SOUR BUS

:ARM:COUN INF

:OUTP ON

:INIT

*TRG

Restore GPIB defaults.

Select BUS control source.

Set arm layer count to inﬁnite.

Turn on output.

Take SourceMeter out of idle.

Trigger one measurement.

Keithley 6430 User Manual

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