Exfo FTB-500 (Window XP) Manual do Utilizador descarregar pdf (Página 258)

100

101

Using FTB Products in an Automated Test Environment

250 FTB-500

Standard Status Data Structure

The following table presents a summary of the possible operations on STB

and SRE registers.

The diagram displayed on the next page is a useful aid in understanding

the general commands and how a service request (SRQ) is generated.

Using a service request, a device notifies the controller that an event

requiring special attention occurred. The controller will then find which

device generated a SRQ (its RQS bit is set) and the causes of it.

STB  Use *STB?.

 Use serial poll (GPIB

bus sequence that

allows retrieval of the

value without

interrupting the current

process).

Impossible to write;

the register content is

only modified when

the Event registers or

Queues are modified.

Use *CLS before

sending a query (to

clear the Event registers

and Queues and by the

same token clear the

STB register).

SRE Use *SRE?. Use *SRE with a value

equal to 0 to disable

the register or with a

value equal to 1 to

enable it.

 Use *SRE with a

value equal to 0.

 At startup, the

1 2 ... 253 254 255 256 257 258 259 260 261 262 263 ... 480 481

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