12-8 Common Commands Model 2700 Multimeter/Switch System User’s Manual
I *WAI — Wait-to-Continue Prevent execution of commands until
previous commands are completed
Description
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
commands while device operations of the Overlapped command are still in progress.
Use the *WAI command 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.
The Model 2700 has three overlapped commands:
• :INITiate
• :INITiate:CONTinuous ON
• *TRG
NOTE See *OPC, *OPC? and *TRG for more information.
The INITiate commands remove the Model 2700 from the idle state. The device
operations of :INITiate are not considered complete until the Model 2700 returns to idle.
By sending the *WAI command after the INITiate command, all subsequent commands
will not execute until the Model 2700 goes back into idle.
The *TRG command issues a bus trigger that could be used to provide the arm, scan, and
measure events for the Trigger Model. By sending the *WAI command after the *TRG
command, subsequent commands will not executed until the pointer for the Trigger
Model
has finished moving in response to *TRG and has settled at its next state.
Programming example – The following command sequence shows how to use the WAI
command to allow the 2700 to wait for the programmed measurements to be completed
before requesting a reading.
SYST:PRES ‘ Returns 2700 to default setup.
INIT:CONT OFF ‘ Disables continuous initiation.
ABORt ‘ Aborts operation. Places 2700 in idle.
TRIG:COUN 1 ‘ These two commands configure the 2700
SAMP:COUN 30 ‘ to perform 30 measurements.
INIT ‘ Starts measurement process.
*WAI ‘ Sends the WAI command. Program waits for
‘ 2700 to go into idle before executing next command.
DATA? ‘ Requests one reading.
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