Keithley 2000/E Digital-Multimeter, DMM, 2000/E Datenbogen
Produktcode
2000/E
Status Byte and Service Request (SRQ)
Service request is controlled by two 8-bit registers: the Status Byte Register and the Ser-
vice Request Enable Register. Figure 4-10 shows the structure of these registers.
Status Summary Messages
* STB?
Serial Poll
OSB
(B7)
RQS
(B6)
MSS
ESB
(B5)
MAV
(B4)
QSB
(B3)
EAV
(B2) (B1) (B0)
OR
* SRE
* SRE?
Status Byte
Register
Register
Service
Request
Enable
Register
Request
Enable
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
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
OR = Logical OR
OSB
(B7) (B6)
ESB
(B5)
MAV
(B4)
QSB
(B3)
EAV
(B2) (B1) (B0)
&
&
&
&
&
MSB
MSB
&
Service
Request
Generation
Read by Serial Poll
Read by *STB?
Figure 4-10
Status byte and
service request
(SRQ)
Status byte and
service request
(SRQ)
2000-900 (J - Aug 2010) BOOK.fm Page 25 Wednesday, October 12, 2011 12:29 PM