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5-31. Overlapped Commands
Commands that begin execution but require slightly more time to complete are called
overlapped commands, because they can be overlapped by the next command before they
have completed execution.
The 31 overlapped commands are:
CHAN
TRIG_CHAN
TRIG
RANGE
TDPULSE
TMWAVE
INCR
VIDEOFMT
MULT
OUT
You can use the command *WAI to wait until the overlapped command has completed
execution before executing the next command. For example,
SCOPE MARKER OUT 10 ms ; *WAI
You can also use the status commands *OPC and *OPC? to detect completion of
overlapped commands. (See "Checking 5820A Status.")
5-32. Sequential Commands
Commands that execute immediately are called sequential commands.
The majority of the commands, 87 of 111 commands, are sequential.
5-33. Commands that Require the Calibration Switch to be Enabled
The following commands do not work unless the rear panel CALIBRATION switch is in
the ENABLE position:
FORMAT ALL
FORMAT CAL
*PUD
Attempting to use any of these commands with the CALIBRATION switch in the
NORMAL position logs an error into the error queue. (Or it returns the error message if
in the RS-232 Terminal Mode.)
5-34. Commands for RS-232 Only
The IEEE-488 and RS-232 interfaces both send commands to the 5820A Calibrator as
data, except for those IEEE-488 functions that must be implemented as a message as
specified in the IEEE-488 standards. For example, the RS-232 interface uses the
command REMOTE to place the 5820A Calibrator in the remote mode. Although the
IEEE-488 interface could also send a command REMOTE as data, it does not because
this is one of the functions that must be implemented per IEEE-488 Standards.
RANGELCK
REFCLOCK
*RST
FASTEDG
ZERO_MEAS
REF10MHZ
SCOPE
TRIGSKEW
STBY
CAL_ABORT
DC_OFFSET
CAL_BACKUP
WAVE
CAL_NEXT
VIDEOMARK
CAL_SKIP
OPER
CAL_START
OUT_IMP
CAL_SECT
5
Remote Operation
Using Commands
OLDREF
5-31
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