Technical data

Power Meter Remote Operation 1

N1911A/1912A P-Series Power Meters Programming Guide 51

Figure 1-7 Generalized Status Register Model

When a status group is implemented in an instrument, it always contains

all of the component registers. However, there is not always a

corresponding command to read or write to every register.

Condition Register

The condition register continuously monitors the hardware and firmware

status of the power meter. There is no latching or buffering for this

Transition Filter

The transition filter specifies which types of bit state changes in the

condition registers and set corresponding bits in the event register.

Transition filter bits may be set for positive transitions (PTR), negative

transitions (NTR), or both. Transition filters are read- write. They are

unaffected by *CLS or queries. After STATus:PRESet the NTR register is

set to 0 and all bits of the PTR are set to 1.

Event Register

The event register latches transition events from the condition register as

specified by the transition filter. Bits in the event register are latched and

on setting they remain set until cleared by a query or a *CLS. Also on

setting, an event bit is no longer affected by condition changes. It remains

set until the event register is cleared; either when you read the register or

when you send the *CLS (clear status) command. Event registers are

read- only.

Bit 0

Bit 1

Bit 2

Bit 3

Condition

Tr an sit io n

Filter

Event

Enable

Logical OR

Summary

Bit