GPIB OPERATION
4-6
Mnemonic
(contd.)
Name and Description
*RST
Reset Command. Sets the instrument functions to the factory default power up state. The
default settings appear in Table 4-1.
*TST?
Self Test Query. Returns a '0' when the GPIB interface and processor are operating.
*OPC
Operation Complete Command. Sets the Operation Complete bit in the Standard Event
Status Register when execution of the preceding operation is complete.
*OPC?
Operation Complete Query. Returns a '1' when the preceding operation has been
completed.
*WAI
Wait to Continue Command. Inhibits execution of an overlapped command until the
execution of the preceding operation has been completed.
*TRG
Trigger Command. Equivalent to Group Execute Trigger.
*PUD <block>
Protected User Data Command. Sets the Protected User Data, accepts Definite Block
Data when enabled. This command is covered in further detail in the Service Manual.
*PUD?
Protected User Data Query. Returns the User Data as a Definite Block Response.
Example:
#221Inventory Number 1234
*STB?
Read Status Byte Query. Returns the value of the Status Byte as an nr1 number (0-255).
*SRE <nrf>
Service Request Enable Command. Sets the Service Request Enable Register.
*SRE?
Service Request Enable Query. Returns the value of the Service Request Enable Register
as nr1.
*ESR?
Standard Event Status Register Query. Returns the value of the Status Event Status
Register as nr1.
*ESE <nrf>
Standard Event Status Enable Command. Sets the Standard Event Enable Register.
*ESE?
Standard Event Status Enable Query. Returns the value of the Standard Event Status
Enable Register as nr1.
*CLS
Clear Status Command. Clears all the Status Event registers and clears the Error Queue.
Does not affect the Enable Registers.
The IEEE 488.2 Device Clear function only affects the GPIB functions. The input and
output buffers are cleared and the instrument put into a state to accept new Messages. It no
longer puts the instrument functions into a defined state, this is now performed by the *RST
common command.