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User Manual 3155

Programming Reference 4-69

Reading the Status

Byte Register

The Status Byte summary register can be read with the *STB? com-

mon query. The *STB? common query causes the generator to send

the contents of the Status Byte register and the MSS (Master Sum-

mary Status) summary message as a single <NR1 Numeric Re-

sponse Message> element. The response represents the sum of the

binary-weighted values of the Status Byte Register. The *STB?

common query does not alter the status byte.

Clearing the Status

Byte Register

Removing the reasons for service from Auxiliary Status registers can

clear the entire Status Byte register. Sending the *CLS command to

the device after a SCPI command terminator and before a Query

clears the Standard Event Status Register and clears the output

queue of any unread messages. With the output queue empty, the

MAV summary message is set to FALSE. Methods of clearing other

auxiliary status registers are discussed in the following paragraphs.

Service Request En-

able Register (SRE)

The Service Request enable register is an 8-bit register that enables

corresponding summary messages in the Status Byte Register.

Thus, the application programmer can select reasons for the gen-

erator to issue a service request by altering the contents of the Serv-

ice Request Enable Register.

The Service Request Enable Register is read with the *SRE? com-

mon query. The response to this query is a number that represents

the sum of the binary-weighted value of the Service Request Enable

The Service Request Enable Register is written using the *SRE

command followed by a decimal value representing the bit values of

the Register. A bit value of 1 indicates an enabled condition. Conse-

quently, a bit value of zero indicates a disabled condition. The Serv-

ice Request Enable Register is cleared by sending *SRE0. The gen-

erator always ignores the value of bit 6. Summary of *SRE com-

mands is given in the following.

*SRE0 - Clears all bits in the register.

*SRE1 - Not used.

*SRE2 - Not used.

*SRE4 - Not used.

*SRE8 - Not used.

*SRE16 - Service request on MAV.

*SRE32 - Service request on ESB summary bit.

*SRE128 - Not used.

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