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Chapter 6 129

Advanced Operations

Status Reporting

Transition Filters are read-write. Transition Filters are unaffected by a

*CLS (clear status) command or queries. The Transitions Filters are set

to pass positive transitions (PTR) at power on and after receiving the

*RST (reset) command (all 16 bits of the PTR register set to 1 and all 16

bits of the NTR register set to 0).

Event Register The Event Register captures bit-state transitions in

the Condition Register as defined by the Transition Filters. Each bit in

the Event Register corresponds to a bit in the Condition Register, or if

there is no Condition Register/Transition Filter combination, each bit

corresponds to a specific condition in the Test Set. Bits in the Event

query of the Event Register or a *CLS (clear status) command. This

guarantees that the application can’t miss a bit-state transition in the

Condition Register. There is no buffering; so while an event bit is set,

subsequent transitions in the Condition Register corresponding to that

bit are ignored. Event Registers are read-only. Event Registers in the

Test Set are either 8 or 16 bits long and may contain unused bits. All

unused bits return a zero value when read.

Event Enable Register The Event Enable Register defines which

bits in the Event Register will be used to generate the Summary

Message. Each bit in the Enable Register has a corresponding bit in the

Event Register. The Test Set logically ANDs corresponding bits in the

Event and Enable registers and then performs an inclusive OR on all

the resulting bits to generate the Summary Message. By using the

enable bits the application program can direct the Test Set to set the

Summary Message to the 1 or TRUE state for a single event or an

inclusive OR of any group of events. Enable Registers are read-write.

Enable Registers in the Test Set are either 8 or 16 bits long and may

contain unused bits which correspond to unused bits in the associated

Event Register. All unused bits return a zero value when read and are

ignored when written to. Enable Registers are unaffected by a *CLS

(clear status) command or queries.

Summary Message Bit The Summary Message is a single-bit

message which indicates whether or not one or more of the enabled

events have occurred since the last reading or clearing of the Event

and Enable registers and then performs an inclusive OR on all the

resulting bits to generate the Summary Message. By use of the enable

bits, the application program can direct the Test Set to set the

Summary Message to the 1, or TRUE, state for a single event or an

inclusive OR of any group of events. The Summary Message is TRUE

when an enabled event in the Event Register is set TRUE. Conversely,

the Summary Message is FALSE when no enabled events are TRUE.

Summary Messages are always seen as bits in another register.

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