Agilent Technologies E1300B, E1301B, 75000 SERIES B user manual Ese?, Esr?

Reading the Standard

Event Status Enable

Register Mask

Reading the Standard Event Status Register

Operation Status Group

NOTE

unmasked, an GPIB service request (SRQ) will be generated. ("Interrupting the External Computer", later in this chapter contains an example program which demonstrates this sequence).

Note that the Standard Event Status Register bits that are not unmasked still respond to their corresponding conditions. They do not, however, set bit 5 in the Status Byte Register.

You can determine which bits in the Standard Event Status register are unmasked with the command:

* ESE?

This command returns the decimal weighted sum of all unmasked bits.

The Standard Event Status Enable register is cleared (all bits masked) by sending the command:

*ESE 0

You can determine which bits in the Standard Event Status register are set using the command:

*ESR?

This command returns the decimal weighted sum of all set bits. *ESR? clears the register. *CLS also clears the register.

Both of these commands return the decimal weighted sum of all set or enabled bits.

The registers in the Standard Operation Status Group provide information about the state of measurement functions within an instrument. These functions are represented by bits in the Condition register which is described in Table 4-3.

The System Instrument (Command Module) only uses bit 8 in the Condition register. Bit 8 (when set) indicates that an interrupt set up by the DIAGnostic:INTerrupt commands has occurred and has been acknowledged.

The registers in the Operation Status Group and the DIAGnostic:INTerrupt commands are only used when, for a specific VXIbus interrupt line, it is necessary to replace the operating system’s interrupt service routine with the System Instrument’s service routine. Agilent VXIbus devices used with the Command Module use the operating system service routine. The VXIbus interrupt line that is used by these devices (primarily line 1), should not be used with the DIAGnostic:INTerrupt commands.

The DIAGnostic:INTerrupt commands are covered in Chapter 5.

Controlling Instruments Using GPIB 6-7