Interface Ready And Status; Get (Group Execute Trigger) - Stanford Research Systems SR810 Manual

Remote Programming
Values returned by the SR810 are sent as a string
of ASCII characters terminated by a carriage
return <cr> on RS-232 and by a line-feed <lf> on
GPIB. If multiple queries are sent on one
command line (separated by semicolons, of
course) the answers will be returned individually,
each with a terminator.
Examples of Command Formats
FMOD 1 <lf>
FREQ 10E3 <lf>
*IDN? <lf>
STRT <lf>
OUTP? 1 <lf>

INTERFACE READY AND STATUS

The Interface Ready bit (bit 1) in the Serial Poll
Status Byte signals that the SR810 is ready to
receive and execute a command. When a
command is received, this bit is cleared indicating
that an operation is in progress. While the
operation is in progress, no other commands will
be processed. Commands received during this
time are stored in the buffer to be processed later.
Only GPIB serial polling will generate a response
while a command is in progress. When the
command execution terminates, the Interface
Set reference source to
internal
Set the internal reference
frequency to 10000 Hz
(10 kHz)
Queries the device
identification
Starts data acquisition
Queries the value of X
Ready bit is set again and new commands will be
processed. Since most commands execute very
quickly, the host computer does not need to
continually check
Commands may be sent one after another and
they will be processed immediately.
When using the GPIB interface, serial polling may
be used to check the Interface Ready bit in the
Serial Poll Byte while an operation is in progress.
After the Interface Ready bit becomes set,
signalling the completion of the command, then
the ERR or ESB bit may be checked to verify
successful completion of the command.
If the RS-232 interface is used, or serial polling is
not available, then the *STB?, *ESR?, ERRS?,
and LIAS? status query commands may be used
to query the Status Bytes. Since the SR810
processes one command at a time, the status
query will not be processed until the previous
operation is finished. Thus a response to the
status query in itself signals that the previous
command is finished. The query response may
then be checked for various errors.

GET (GROUP EXECUTE TRIGGER)

The GPIB interface command GET is the same as
the TRIG command. GET is the same as a trigger
input. GET only has an effect if the sampling rate
is triggered or if triggers start a scan.
5-2
the Interface Ready bit.