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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 current 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 reg-
isters. 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
Register.
Use the *ESR? Common Command to read the Standard Event Register. All other event reg-
isters 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
4-20 Remote Operation