Agilent Technologies N8201A Service Manual download pdf (Page 110)

110 Agilent N8211A/N8212A Performance Upconverter Synthetic Instrument Module, 250 kHz to 20 / 40 GHz

4 Programming the Status Register System

Status Groups

The Standard Operation Status Group and the Data Questionable Status Group consist of

the registers listed below. The Standard Event Status Group is similar but does not have

negative or positive transition filters or a condition register.

Condition Register Continuously monitors the hardware and firmware status of the

N8211A/N8212A. There is no latching or buffering for a condition register; it is updated in

real time.

Negative Transition Filter Specifies the bits in the condition register that will set

corresponding bits in the event register when the condition bit changes from 1 to 0.

Positive Transition Filter Specifies the bits in the condition register that will set

corresponding bits in the event register when the condition bit changes from 0 to 1.

Event Register Latches transition events from the condition register as specified by the

positive and negative transition filters. Once the bits in the event register are set, they

remain set until cleared by either querying the register contents or sending the *CLS

command.

Event Enable Register Specifies the bits in the event register that generate the summary

bit. The N8211A/N8212A logically ANDs corresponding bits in the event and enable

registers and ORs all the resulting bits to produce a summary bit. Summary bits are, in turn,

used by the Status Byte Register.

A status group is a set of related registers whose contents are programmed to produce

status summary bits. In each status group, corresponding bits in the condition register are

filtered by the negative and positive transition filters and stored in the event register. The

contents of the event register are logically ANDed with the contents of the enable register

and the result is logically ORed to produce a status summary bit in the Status Byte Register.

Standard Event Status Group

The Standard Event Status Group is used to determine the specific event that set bit 5 in the

Status Byte Register. This group consists of the Standard Event Status Register (an event

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Agilent Technologies N8201A Service Manual Page 110