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User Manual 3155

Programming Reference 4-70

Standard Event

Status Register

(ESR)

The Standard Event Status Register reports status for special appli-

cations. The 8 bits of the ESR have been defined by the IEEE-STD-

488.2 as specific conditions, which can be monitored and reported

back to the user upon request. The Standard Event Status Register

is destructively read with the *ESR? common query. The Standard

Event Status Register is cleared with a *CLS common command,

with a power-on and when read by *ESR?.

The arrangement of the various bits within the register is firm and is

required by all GPIB instruments that implement the IEEE-STD-

488.2. Description of the various bits is given in the following:

Bit 0 - Operation Complete. Generated in response to the *OPC

command. It indicates that the device has completed all selected and

pending operations and is ready for a new command.

Bit 1 - Request Control. This bit operation is disabled on the Model

3155.

Bit 2 - Query Error. This bit indicates that an attempt is being made

to read data from the output queue when no output is either present

or pending.

Bit 3 - Device Dependent Error. This bit is set when an error in a de-

vice function occurs. For example, the following command will cause

a DDE error:

VOLTage 5;:VOLTage:OFFSet 2

Both of the above parameters are legal and within the specified lim-

its, however, the generator is unable to generate such amplitude and

offset combination.

Bit 4 - Execution Error. This bit is generated if the parameter follow-

ing the command is outside of the legal input range of the generator.

Bit 5 – Command Error. This bit indicates the generator received a

command that was a syntax error or a command that the device does

not implement.

Bit 6 - User Request. This event bit indicates that one of a set of lo-

cal controls had been activated. This event bit occurs regardless of

the remote or local state of the device.

Bit 7 - Power On. This bit indicates that the device's power source

was cycled since the last time the register was read.

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Racal Instruments 3155 Spezifikationen Seite 181