
User Manual 3153
SCPI Command Reference 4-20
Reading the Status
Byte Register
The Status Byte summary register can be read with the *STB? common
query. The *STB? common query causes the generator to send the
contents of the Status Byte register and the MSS (Master Summary
Status) summary message as a single <NR1 Numeric Response
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
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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