Keithley 2000 User Manual page 113

Service request enable register
This register is programmed by you and serves as a mask for the Status Summary Message
bits (B0, B2, B3, B4, B5, and B7) of the Status Byte Register. When masked, a set summary bit
in the Status Byte Register cannot set bit B6 (MSS/RQS) of the Status Byte Register. Converse-
ly, when unmasked, a set summary bit in the Status Byte Register sets bit B6.
A Status Summary Message bit in the Status Byte Register is masked when the corresponding
bit in the Service Request Enable Register is cleared (0). When the masked summary bit in the
Status Byte Register sets, it is ANDed with the corresponding cleared bit in the Service Request
Enable Register. The logic "1" output of the AND gate is applied to the input of the OR gate and,
thus, sets the MSS/RQS bit in he Status Byte Register.
The individual bits of the Service Request Enable Register can be set or cleared by using the
following common command: *SRE <NRf>
To read the Service Request Enable Register, use the *SRE? query command. The Service
Request Enable Register clears when power is cycled or a parameter (n) value of zero is sent
with the *SRE command *SRE 0).
Remote Operation 4-27