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Service Request Enable *SRE 128 Enables the OPER summary bit from the Status Byte register to generate RQS. Operation Condition STAT:OPER:EVEN? 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. 1All bits of the PTR registers bits are set to 1 at power on or in response to STAT:PRES. Adding More Operation Events 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: STAT:OPER:PTR 1280;ENAB 1280 It is not necessary to change any other registers, since the programming for the operation summary bit (OPER) path has already been done. Servicing Questionable Status Events To add OC (overcurrent) and OT (overtemperature) events to this example, program Questionable Status group bits 1 and 4. STAT:QUES:PTR 18;ENAB 18 Next, you must program the Service Request Enable register to recognize both the questionable (QUES) and the operational (OPER) summary bits. *SRE 136 Now when there is a service request, read back both the operational and the questionable event registers. STAT:OPER:EVEN?;QUES:EVEN? Monitoring Both Phases of a Status Transition 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: STAT:OPER:PTR 1024;NTR 1024 STAT:OPER:ENAB 1024;*SRE 128 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. 56 Status Reporting SCPI Command Completion SCPI commands sent to the power supply are processed either sequentially or in parallel. Sequential commands finish execution before a subsequent command begins. A parallel command can begin execution while a preexisting command is still executing (overlapping commands). Commands that affect trigger actions are among the parallel commands. The *WAI, *OPC, and *OPC? common commands provide different ways of indicating when all transmitted commands, including any parallel ones, have completed their operations. The syntax and parameters for these commands are described in "Chapter 3 - Language Dictionary". Some practical considerations for using these commands are as follows: *WAI This prevents the power supply from processing subsequent commands until all pending operations are completed. If something prevents completion of an existing operation, *WAI can place the power supply and the controller in a "hang- up" condition. *OPC? This places a 1 in the Output Queue when all pending operations have completed. Because it requires your program to read the returned value from the queue before executing the next program statement, *OPC? could prevent subsequent commands from being executed. *OPC This sets the OPC status bit when all pending operations have completed. Since your program can read this status bit on an interrupt basis, *OPC allows subsequent commands to be executed. The trigger subsystem must be in the Idle state in order for the status OPC bit to be true. Therefore, as far as triggers are concerned, OPC is false whenever the trigger subsystem is in the Initiated state. However, OPC is also false if there are any commands still pending. Note For a detailed discussion of *WAI, *OPC and *OPC?, see "Device/Controller Synchronization Techniques" in ANSI/IEEE Std 488.2. DFI (Discrete Fault Indicator) Whenever a fault is detected in the power supply, it is capable of generating a FLT signal at the digital port (see "Appendix D - Digital Port Functions" in the power supply Operating Guide). The source for the DFI signal can be any Questionable, Operation, or Standard Event status event (see Figure 4-1). RI (Remote Inhibit) Whenever a remote inhibit signal is received at the digital port (see “Appendix D - Digital Port Functions” in the power supply Operating Guide), the power supply will receive an RI event at the Questionable Status register. By programming the status subsystem, you may use RI to generate a service request (SRQ) to the controller and/or to create a DFI output at the digital port. By using RI/DFI in this way, you can chain the power supplies to create a serial shutdown in response to the INH input. Status Reporting 57 Error Messages Power Supply Hardware Error Messages Front panel error messages resulting from selftest errors or runtime failures are described in “Chapter 3 - Turn-On Checkout” of the power supply Operating Guide. Calibration Error Messages Front panel error messages resulting from calibration errors are described in Appendix A of the power supply Operating Guide. System Error Message...

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