Instruction manual

Chapter 4 Command Reference

Common Commands

Programming Guide 4-43

Common Commands

The IEEE 488.2 Common Commands are general-purpose commands that

are common to all instruments (as defined in IEEE 488.2). These commands

are generally not related to measurement configuration. They are used for

functions like resetting the instrument, identification, or synchronization.

*CLS (Clear Status Command)

COMMAND *CLS

Clears all event registers summarized in the status byte (Standard Event

Status Register, Operation Event Status Register, and Questionable Data

Event Status Register) and clears the Error Queue.

COMMENTS • The *CLS command does not clear data memories or any other settings.

• *CLS places the instrument in “Operation Complete Idle State” and

“Operation Complete Query Idle State” (IEEE 488.2). This results in

the disabling of any prior *OPC command.

• If *CLS immediately follows a program message terminator, the

output queue and the MAV bit are cleared, since any new program

message after a program-message terminator clears the output queue.

• This command clears any displayed error message from the front

panel.

• If the front panel is displaying any menu when *CLS is received, the

menu is abandoned (equivalent to pressing the Clear key).

FRONT-PANEL

KEYS

Clear