Cha
ter Seven: IEEE-488 Communications O
tion IEEE-488 Messa
es
109
IEEE-488 Messages
The 670 instrument supports standard IEEE-488 messages, along with the MKS device
dependent messages. The messages include both
commands
that instruct the 670 instrument to
perform a task, and
queries
that request information from the 670 instrument.
Note
The IEEE-488 messages are
not
case sensitive. You may enter the
commands in either upper- or lowercase.
Clear Status Command (*CLS)
The CLS command clears all status data structures and/or registers. The registers are SESR,
OPERation Status Register, QUEStionable Status Register, and Error/Event Queue.
Operation Complete Messages
The operation complete messages determine the status of an instrument, whether it is performing
a task or idle.
Operation Command (*OPC)
The operation complete command is ignored since the 670 instrument executes only one
command at a time.
Operation Complete Query (*OPC?)
Since the 670 instrument executes only one command at a time the response to an operation
complete query is always complete and the query will return a value of 1.
Wait-to-Continue Command (*WAI)
The Wait-to-Continue command functions like a “no operation” command in the 670 instrument.
The normal function of this command causes the instrument to stop executing commands until
either the “no operation pending” state is true, or the 670 instrument is rebooted, or a Device
Clear Active State (DCAS) message is received. Since the 670 instrument always processes
messages sequentially, the “no operation pending” state is always true.
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