Martel Electronics DMC1400 - Manual (Page 38)

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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 caus-
es program execution to pause until all operations are complete.
*RST Resets the state of the instrument to the power-up state. This command
holds off execution of subsequent commands until it is complete.
*SRE Loads a byte into the Service Request Enable register.
*SRE? Returns the byte from the Service Request Enable register.
*STB? Returns the status byte.
*WAI Prevents further remote commands from being executed until all previous
remote commands have been executed.