Agilent Technologies 664xA Manuale Utente

 56     Status Reporting

 Table 4-5.  Generating RQS from the CC Event

 

 

 

 

Operation PTR

 

 

Allows a positive transition at the CC input (bit 10) to be
latched into the Status Event register.

1

 

Operation Enable

 

 

Allows the latched CC event to be summed into the OPER
summary bit.

 

Service Request Enable

 

 

Enables the OPER summary bit from the Status Byte register to
generate RQS.

 

Operation Condition

 

 

When you service the request, read the event register to
determine that bit 10 (CC) is set and to clear the register for the
next event.

 
 

1

All bits of the PTR registers bits are set to 1 at power on or in response to STAT:PRES.

 
 

 
 To add the CV (constant voltage) event to this example, it is only necessary to add the decimal values for bit 8 (value 64) to
the programming commands of the Operation Status group.  The commands to do this are:
 
 

 
 It is not necessary to change any other registers, since the programming for the operation summary bit (OPER) path has
already been done.

 
 To add OC (overcurrent) and OT (overtemperature) events to this example, program Questionable Status group bits 1 and 4.
 
 

 
 Next, you must program the Service Request Enable register to recognize both the questionable (QUES) and the operational
(OPER) summary bits.
 
 

 
 Now when there is a service request, read back both the operational and the questionable event registers.
 
 

 
 You can monitor a status signal for both its positive and negative transitions.  For example, to generate RQS when the
power supply either enters the CC (constant current) condition or leaves that condition, program the Operational Status
PTR/NTR filter as follows:
 
 

 

 
 The PTR filter will cause the OPER summary bit to set RQS when CC occurs.  When the controller subsequently reads the
event register (STAT: OPER: EVEN?), the register is cleared.  When CC subsequently goes false, the NTR filter causes the
OPER summary bit to again set RQS.