
3151 And 3151A User Manual
SCPI Command Reference 4-19
Clearing the Status
Byte Register
The entire Status Byte register can be cleared by removing the
reasons for service from Auxiliary Status registers. 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
Enable 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
generator to issue a service request by altering the contents of the
Service Request Enable Register.
The Service Request Enable Register is read with the *SRE?
common query. The response to this query is a number that
represents the sum of the binary-weighted value of the Service
Request Enable Register. The value of the unused bit 6 is always
zero.
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.
Consequently, a bit value of zero indicates a disabled condition. The
Service Request Enable Register is cleared by sending *SRE0. The
generator always ignores the value of bit 6. Summary of *SRE
commands 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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