Agilent Technologies Serials 2933A-08856 to 08860 3025A-09316 and, Agilent 6031A Output Queue

Status Programming Examples

SRE 255

Enables all bits to generate seruice requests

SRE 239

Excludes the MAV bit from gerlerating a service request

SRE 8

Enables only Questionable events to generate service requests

Output Queue

The Output Queue is a FIFO (first-in, first-out) data structure that stores power supply-to-controller messages until the controller reads them.

Whenever the queue holds one or more bytes, it sets the MAV bit (4) in the Status Byte register. The Output Queue is cleared by *CLS and at power turn on.

SCPI ERROR MESSAGES

Error messages are obtained remotely with the SYST:ERR? query. The error number is the value that is placed in the error queue. SYST:ERR? returns the error number into a variable and combines the error number and the error message into a string. There are two types of error messages stored in the power supply error queue, system errors and device-dependent errors.

System Errors

Table C-5 lists the system errors, which are associated with SCPI syntax errors and interface problems. Information inside the brackets is not part of the standard error message, but is included for clarification. When system errors occur, the Standard Event Status register (see "Status Reporting"’) records them as follows:

Standard Event Status Register Error Bits

Bit Set

Error Code

Error Type

5

4

3

2

-100 thru -199

-200 thru - 299

-300 thru - 399

-400 thru - 499

Command

Execution

Device-dependent

Query

Device-Dependent Errors

Hardware Errors During Turn-On Selftest. If a GP-IB failure occurs during selftest, the power supply may or may not be able to communicate with the controller. If possible, error - 330 (Self Test Error) is placed in the error queue. If a power supply output error occurs during selftest, error -330 and error -240 (Hardware Error) are placed in the queue. In addition, the error appears on the display (see the Operating manual). If output errors occur, the power supply will generate one or more - 240 errors for each command it cannot process. Use the SYST:ERR? query to read the error queue after power on to ensure that no - 330 or - 240 errors are present. Any power supply value returned by a query (such as MEAS:CURR?) should be assumed to be invalid.

Standard Commands for Programmable Instruments (SCPI) 109