HP VXI 75000 C Series, User'S And Scpi Programming Manual

Page: 204 / 438

204 HP E1415 Command Reference Chapter 6
FETCh?
Subsystem Syntax
FETCh? returns readings stored in VME memory.
Comments
•
This command is only available in systems using an HP E1405B or
HP E1406A command module.
•
FETCH? does not alter the readings stored in VME memory. Only the *RST or
INIT
…
commands will clear the readings in VME memory.
•
The format of readings returned is set using the FORMat[:DATA] command.
•
Returned Value: REAL,32, REAL,64, and PACK,64, readings are returned in
the IEEE-488.2-1987 Definite Length Arbitrary Block Data format. This data
return format is explained in “Arbitrary Block Program and Response Data”
on page 160. For REAL,32, readings are 4 bytes in length. For REAL 64, and
PACK, 64, readings are 8 bytes in length.
•
PACKed,64 returns the same values as REAL,64 except for Not-a-Number
(NaN), IEEE +INF and IEEE -INF. The NaN, IEEE +INF and IEEE -INF
values returned by PACKed,64 are in a form compatible with HP Workstation
BASIC and HP BASIC/UX. Refer to the FORMat command for the actual
values for NaN, +INF, and -INF.
•
ASCii is the default format.
•
ASCII readings are returned in the form
±
1.234567E
±
123. For example 13.325
volts would be +1.3001. Each reading is followed by a comma (,). A
line feed (LF) and End-Or-Identify (EOI) follow the last reading.
•
Related Commands: MEMory Subsystem, FORMat[:DATA]
•
*RST Condition: MEMORY:VME:ADDRESS 240000;
MEMORY:VME:STATE OFF; MEMORY:VME:SIZE 0