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Programming the HP E1415 for PID Control
89
FIFO Status Commands
[SENSe:]DATA:FIFO:COUNt? returns a count of the values in the FIFO
buffer. Use with the DATA:FIFO:PART? or DATA:FIFO:ALL? commands
[SENSe:]DATA:FIFO:COUNt:HALF? returns a 1 if the FIFO is at least
half full (32,768 values) or a 0 if not. Use with the DATA:FIFO:HALF?
command.
All of the FIFO commands except SENS:DATA:FIFO:ALL? can execute
while the module continues to run algorithms. Once a FIFO Transfer
command is executed, the instrument can not accept other commands until
the transfer is complete as specified for each command above. The FIFO
Status commands allow you to poll the instrument for availability of values
before executing a transfer command.
Which FIFO Mode?
The way you will read the FIFO depends on how the FIFO mode was set in
the programming step 7 of the “Programming Sequence” on page 60.
Continuously Reading the FIFO (FIFO mode BLOCK)
If you are going to read the FIFO while algorithms are running you must set
the FIFO mode to SENS:DATA:FIFO:MODE
BLOCK. In this mode if
the FIFO fills up, it stops accepting values from algorithms. The algorithms
continue to execute, but the latest data is lost. To avoid losing any FIFO data,
your application needs to read the FIFO often enough to keep it from
overflowing. Here’s a flow diagram to show you where and when to use the
FIFO commands.
Begin Data Retrieval
Exit Data Retrieval
Algorithm Stopped?
Any Values in FIFO?
Enough Values
in FIFO?
Execute Final Transfer
Command
Execute Bulk Transfer
Command
DATA:FIFO:COUNT?
DATA:FIFO:PART? <n_values>
no
no
no
yes
yes
yes
STAT:OPER:COND?
(bit 4 "measuring")
Figure 3-9. Controlling Reading Count
Summary of Contents for VXI 75000 C Series
Page 2: ......
Page 16: ...16 ...
Page 18: ......
Page 30: ...30 Getting Started Chapter 1 Notes ...
Page 32: ...32 Field Wiring Chapter 2 Figure 2 1 Channel Numbers at SCP Positions ...
Page 44: ...44 Field Wiring Chapter 2 Figure 2 11 HP E1415 Terminal Module ...
Page 54: ...54 Field Wiring Chapter 2 Notes ...
Page 61: ...Programming the HP E1415 for PID Control 61 Chapter 3 Programming Overview Diagram ...
Page 136: ...136 Creating and Running Custom Algorithms Chapter 4 Notes ...
Page 152: ...152 Algorithm Language Reference Chapter 5 Notes ...
Page 304: ...304 HP E1415 Command Reference Chapter 6 Command Quick Reference Notes ...
Page 308: ...308 Specifications Appendix A Thermocouple Type E 200 800C SCPs HP E1501 02 03 ...
Page 309: ...Specifications 309 Appendix A Thermocouple Type E 200 800C SCPs HP E1508 09 ...
Page 310: ...310 Specifications Appendix A Thermocouple Type E 0 800C SCPs HP E1501 02 03 ...
Page 311: ...Specifications 311 Appendix A Thermocouple Type E 0 800C SCPs HP E1509 09 ...
Page 312: ...312 Specifications Appendix A Thermocouple Type E Extended SCPs HP E1501 02 03 ...
Page 313: ...Specifications 313 Appendix A Thermocouple Type E Extended SCPs HP E1508 09 ...
Page 314: ...314 Specifications Appendix A Thermocouple Type J SCPs HP E1501 02 03 ...
Page 315: ...Specifications 315 Appendix A Thermocouple Type J SCPs HP E1508 09 ...
Page 316: ...316 Specifications Appendix A Thermocouple Type K SCPs HP E1501 02 03 ...
Page 317: ...Specifications 317 Appendix A Thermocouple Type R SCPs HP E1501 02 03 ...
Page 318: ...318 Specifications Appendix A Thermocouple Type R SCPs HP E1508 09 ...
Page 319: ...Specifications 319 Appendix A Thermocouple Type S SCPs HP E1501 02 03 ...
Page 320: ...320 Specifications Appendix A Thermocouple Type S SCPs HP E1508 09 ...
Page 321: ...Specifications 321 Appendix A Thermocouple Type T SCPs HP E1501 02 03 ...
Page 322: ...322 Specifications Appendix A Thermocouple Type T SCPs HP E1508 09 ...
Page 323: ...Specifications 323 Appendix A 5K Thermistor Reference SCPs HP E1501 02 03 ...
Page 324: ...324 Specifications Appendix A 5K Thermistor Reference SCPs HP E1508 09 ...
Page 325: ...Specifications 325 Appendix A RTD Reference SCPs HP E1501 02 03 ...
Page 326: ...326 Specifications Appendix A RTD SCPs HP E1501 02 03 ...
Page 327: ...Specifications 327 Appendix A RTD SCPs HP E1508 09 ...
Page 328: ...328 Specifications Appendix A 2250 Thermistor SCPs HP E1501 02 03 ...
Page 329: ...Specifications 329 Appendix A 2250 Thermistor SCPs HP E1508 09 ...
Page 330: ...330 Specifications Appendix A 5K Thermistor SCPs HP E1501 02 03 ...
Page 331: ...Specifications 331 Appendix A 5K Thermistor SCPs HP E1508 09 ...
Page 332: ...332 Specifications Appendix A 10K Thermistor SCPs HP E1501 02 03 ...
Page 333: ...Specifications 333 Appendix A 10K Thermistor SCPs HP E1508 09 ...
Page 334: ...334 Specifications Appendix A Notes ...
Page 346: ...346 Glossary Appendix C Notes ...
Page 388: ...388 Generating User Defined Functions Appendix F Notes ...