Agilent Technologies Agilent B2201A - Manual (Page 179)

Agilent B2200 User’s Guide, Edition 4 5-51
SCPI Command Reference
Status Reporting Structure
Figure 5-1 Status Reporting Structure of B2200
The above figure shows Service Request Generation. When a condition occurs that
requires service, the instrument sets Request Service bit (RQS
− bit6) of Status
Byte, and sends a Service Request (SRQ) via GPIB bus to the controller. So, the
controller can execute an interrupt service routine (must be in the program) that uses
a Serial Poll to read Status Byte of each instrument to determine which instrument
requested service. See “Status Byte Register” on page 5-52.