Stanford Research Systems SR810 Manual page 88

Remote Programming
STRT
PAUS
REST
The STRT command starts or resumes data storage. STRT is ignored if
storage is already in progress.
The PAUS command pauses data storage. If storage is already paused
or reset then this command is ignored.
The REST command resets the data buffers. The REST command can
be sent at any time - any storage in progress, paused or not, will be
reset. This command will erase the data buffer.
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