
OPC
Operation Complete. Set to 1 when the calibrator has
finished executing all commands before the command
*OPC was entered.
Error Queue
If an error occurs due to invalid input or buffer overflow, its error code
is sent to the error queue. The error code can be read from the
queue with the command FAULT?. The error queue holds 15 error
codes. When it is empty, FAULT? returns 0. The error queue is
cleared when power is reset or when the clear command *CLS is
entered.
Input Buffer
Calibrator stores all received data in the input buffer. The buffer holds
250 characters. The characters are processed on a first in, first out
basis.
7.4 Remote Commands and Error Codes
The following tables list all commands, and their descriptions, that
are accepted by the calibrator.
Table 5: Common Commands
Command
Description
*CLS
*CLS (Clear status.) Clears the ESR, the error queue, and the
RQS bit in the status byte. Terminates pending Operation
Complete commands
*ESE
Loads a byte into the Event Status Enable register.
*ESE?
Returns the contents of the Event Status Enable register.
*ESR?
Returns the contents of the Event Status register and clears the
register.
*IDN?
Identification query. Returns the manufacturer, model number,
and firmware revision level of the Calibrator.
*OPC
Enables setting of bit 0 (OPC for "Operation Complete") in the
Event Status Register to 1 when all pending device operations
are complete.
*OPC?
Returns a 1 after all pending operations are complete. This
command causes program execution to pause until all opera-
tions are complete.
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