Keithley 6482 - Status Byte and Service Request (SRQ)

13-6 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 13: Status Structure Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
For nondecimal formats, one of the following headers will accompany the returned value to
indicate which format is selected:
#B = Header for binary values
#H = Header for hexadecimal values
#Q = Header for octal values
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 13-3 shows the structure of these registers.
Figure 13-3
Status byte and service request (SRQ)
Table 13-2
Data format commands for reading status registers
Command Description Default
:FORMat:SREGister <name> Select data format for reading status registers:
<name> = ASCiiDecimal format
HEXadecimalHexadecimal format
OCTalOctal format
BINaryBinary format
ASCii
ESB
OSB
ESB
*STB?
OSB*SRE
*SRE?
OR
(B6)
RQS
(B5)(B7)
(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)
__
____
&
&
&
&
&
&