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Users Manual

5-14

the bus responds to the poll by sending the contents of its Status Byte Register. If an

instrument on the bus has made a service request, the request service bit (RQS, bit 6) of its

Status Byte Register will be set to 1, identifying it as an instrument that requested service.

The contents of the Status Byte Register (STB) is determined by the Service Request

Enable Register (SRE), Event Status Register (ESR), Event Status Enable Register

(ESE), and the output buffer. These status registers are discussed below and summarized

in Table 5-5. Figure 5-3 shows the relationship of these registers.

Table 5-5. Status Register Summary

Status Byte Register

Service Request Enable Register

Event Status Register

Event Status Enable Register

*STB?

*SRE?

*ESR?

*ESE?

None

*SRE

None

*ESE

SRE

None

ESE

None

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Fluke 45 Manuale Utente Pagina 73