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Condition registers

As Figure 4-5 shows, all status register sets have a condition register. A condition register is

a real-time, read-only register that constantly updates to reﬂect the present operating conditions

of the instrument. For example, while a measurement is being performed, bit B4 (Meas) of the

Operation Condition Register is set. When the measurement is completed, bit B4 clears.

Use the :CONDition? query commands in the STATus Subsystem to read the condition

registers. See Section 5 for more information.

Event registers

As Figure 4-5 shows, each status register set has an event register. An event register is a

latched, read-only register whose bits are set by the corresponding condition register. Once a bit

in an event register is set, it remains set (latched) until the register is cleared by a speciﬁc clearing

operation. The bits of an event register are logically ANDed with the bits of the corresponding

enable register and applied to an OR gate. The output of the OR gate is applied to the Status Byte

Use the *ESR? Common Command to read the Standard Event Register. All other event

registers are read using the :EVENt? query commands in the STATus Subsystem. See Section 5

for more information.

An event register is cleared when it is read. The following operations clear all event registers:

• Cycling power

• Sending *CLS

Enable registers

As Figure 4-5 shows, each status register set has an enable register. An enable register is

programmed by you and serves as a mask for the corresponding event register. An event bit is

masked when the corresponding bit in the enable register is cleared (0). When masked, a set bit

in an event register cannot set a bit in the Status Byte Register (1 AND 0 = 0).

To use the Status Byte Register to detect events (i.e., serial poll), you must unmask the events

by setting (1) the appropriate bits of the enable registers.

To program and query the Standard Event Status Register, use the *ESE and *ESE? Common

Commands respectively. All other enable registers are programmed and queried using the

:ENABle and :ENABle? commands in the STATus Subsystem. See Section 5 for more

information.

An enable register is not cleared when it is read. The following operations affect the enable

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