144 Sequoia Series
5. Common Commands
Common commands begin with an * and consist of three letters (command) or three letters and a ?
(query). Common commands are defined by the IEEE 488.2 standard to perform some common
interface functions. The power source responds to the required common commands that control status
reporting, synchronization, and internal operations. It also responds to optional common commands
that control triggers, and stored operating parameters.
Common commands and queries are listed alphabetically. If a command has a corresponding query
that simply returns the data or status specified by the command, then both command and query are
included under the explanation for the command. If a query does not have a corresponding command
or is functionally different from the command, then the query is listed separately. The description for
each common command or query specifies any status registers affected. Refer to chapter 7 for details
on how to read specific register bits and use the information that they return.
Common Commands Syntax
*CLS Clear status
*ESE <n> Standard event status enable
*ESE? Return standard event status enable
*ESR? Return event status register
*IDN? Return instrument identification
*OPC 1 Enable "operation complete" bit in ESR
*OPC? Return a "1" when operation complete
*OPT? Return option number
*PSC <bool> Power-on status clear state set/reset
*PSC? Return power-on status clear state
*RCL <n> Recall instrument state
*RST Reset
*SAV <n> Save instrument state
*SRE <n> Set service request enable register
*SRE? Return service request enable register
*STB? Return status byte
*TRG Trigger
*WAI Hold off bus until all device commands done
*TST Performs Self Test
5.1 *CLS
This command clears the following registers (see chapter 7 for descriptions of all status registers):
• Standard Event Status
• Operation Status Event
• Questionable Status Event
• Status Byte
• Error Queue
Command Syntax *CLS
Parameters None
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