Status Byte And Srq - Keithley S46 Instruction Manual

S46/S46T Microwave Switch System Instruction Manual
For more information on these commands, see the specific command listing in the SCPI
command section.

Status byte and SRQ

Service request is controlled by two 8-bit registers: the Status Byte Register and the
Service Request Enable Registers.
Figure 3-6
Status byte and service request (SRQ)
Service
Request
Generation
Status Summary Messages
RQS
(B6)
* STB?
(B7)
Serial Poll MSS
OR
* SRE
* SRE?
(B7) (B6)
Decimal
Weights
MSS = Master Summary Status
RQS = Request for Service
ESB = Event Summary Bit
MAV = Message Available
EAV = Error Available
Figure 3-6 shows the structure for these registers.
ESB MAV EAV
(B5) (B4) (B3) (B2)
&
&
&
ESB MAV EAV
(B5) (B4) (B3) (B2) (B1)
32 16 4
(2 5 ) (2 4 ) (2 2 )
&
OR = Logical OR
Operation
Status Byte
(B1) (B0) Register
Service Request
Enable Register
(B0)
= Logical AND
S46-901-01 Rev. C / January 2006
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