12  Status Registers 
You can use status register programming to determine the operating condition of the AC 
source at any time.  For example, you may program the AC source to generate an MSS bit 
when an event such as a current limit occurs.  When the MSS bit is set, your program can 
then act on the event in the appropriate fashion. 
 
  Service 
    Standard event status  Status  request 
  Event  Enable  Logic  Output  Byte  enable  Logic 
  *ESR?  *ESE      *STB?  *SRE 
  n.u.  0  Queue  n.u.  0 
  n.u.  1  Data  n.u.  1 
  QYE  2  4  4  Data  n.u.  2 
  DDE  3  8  8  Data  n.u.  3 
  EXE  4  16  16  OR  MAV  4  16  16  OR 
  CME  5  32  32  ESB  5  32  32 
  n.u.  6  MSS  6  64  64 
  PON  7  128  128  n.u.  7 
   
 
 
 
Figure 12-1:  AC Source Status System Model 
Figure 12-1 shows the status register structure of the AC source.  The Standard Event, 
Status Byte, and Service Request Enable registers and the Output Queue perform standard 
IEEE-488 functions as defined in the IEEE 488.2 Standard Digital Interface for 
Programmable Instrumentation. 
12.1  Power-On Conditions 
Refer to the *RST command description in paragraph 10.10.6 for the power-on conditions of 
the status registers.