Keithley 2500 User Manual

Models 2500 and 2502 User’s Manual Status Structure 14-7
Status byte and service request (SRQ)
Service request is controlled by two 8-bit registers; the status byte register and the service
request enable register. Figure 14-3 shows the structure of these registers.
Figure 14-3
Status byte and service request (SRQ)
ESB
OSB
ESB
*STB?
OSB*SRE
*SRE?
OR
(B6)
RQS
(B5)(B77)
(B5)(B6)
Serial Poll
Service
Request
Generation
(B7)
MSS
MAV
Status Summary Message
Read by Serial Poll
Read by *STB?
Status Byte
Register
OSB = Operation Summary Bit
MSS = Master Summary Status
RQS = Request for Service
ESB = Event Summary Bit
MAV = Message Available
QSB = Questionable Summary Bit
EAV = Error Available
MSB = Measurement Summary Bit
&= Logical AND
OR = Logical OR
Service
Request
Enable
Register
MAV
(B4)
(B4)
QSB
QSB
(B3)
(B3)
EAV
EAV
(B2)
(B2)
(B1)
(B1)
MSB
MSB
(B0)
(B0)
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Keithley 2500 Specifications

General

Brand	Keithley
Model	2500
Category	Measuring Instruments
Language	English