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inactive state or 0. When querying an event register the information is returned as
a decimal number representing the binary-weighted sum of all bits within the
register.
The Enable registers bits represent the selection of bits that will be logically-ORed
together to form the summary bit in the status byte. The *CLS command will not
clear the enable registers and if you wish to clear the register you must set it to a
value of 0. Like the event register, the enable register is represented as a decimal
number that equals the binary-weighted sum of all bits.
The enable register will clear to value of 0 at power up unless the *PSC 0
command had been executed before power-off. The *PSC command tells the
device whether or not it should clear the enable registers at power-on. Using this
command will allow SQRs to function immediately after power-on.
5.7.7. GPIB Service Request
The service request capability is not available with the RS-232 interface. The
SRQ line will be activated only after one or more of the service request functions
have been enabled using the Status Byte Enable Register command *SRE.
The status byte bit assignments are as described in the previous section for status
reporting. When the instrument has requested service, the enabled bit or bits and
the RQS bit 6 will be active or 1. Bit 4, 5, and 7 are not used and will be set to
false, or 0 for all status byte reads.
After the serial poll (SPOLL) is executed the RQS bit will be cleared to 0, and the
remaining bits will remain unchanged. The status byte will not change value until
the event register is read and cleared for the corresponding status byte bit.
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