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

Page: 239 / 438

HP E1415 Command Reference 239 Chapter 6
[SENSe]
•
Returned Value: ASCII values are returned in the form
±
1.234567E
±
123.
For example 13.325 volts would be +1.3001. Each value is followed
by a comma (,). A line feed (LF) and End-Or-Identify (EOI) follow the last
value. The C-SCPI data type is a string array.
REAL 32, REAL 64, and PACK 64, values 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, each value is 4 bytes in length (the C-SCPI data
type is a float32 array). For REAL 64 and PACK 64, each value is 8 bytes in
length (the C-SCPI data type is a float64 array).
Note
Algorithm values which are a positive overvoltage return IEEE +INF and a negative
overvoltage return IEEE -INF (see Table 6-1 on page 207 for actual values for each
data format).
•
Related Commands: DATA:FIFO:COUNT:HALF?
•
*RST Condition: FIFO buffer is empty
Command
Sequence
DATA:FIFO:COUNT:HALF?
poll FIFO for half-full status
DATA:FIFO:HALF? returns 32768 values
[SENSe:]DATA:FIFO:MODE
[SENSe:]DATA:FIFO:MODE < mode > sets the mode of operation for the FIFO
buffer.
Parameters
Comments
•
In BLOCk(ing) mode, if the FIFO becomes full and measurements are still
being made, the new values are discarded.
•
OVERwrite mode is used record the latest 65,024 values. The module must be
halted (ABORT sent) before attempting to read the FIFO. In OVERwrite
Mode, if the FIFO becomes full and measurements are still being made, new
values overwrite the oldest values.
•
In both modes Error 3021, "FIFO Overflow" is generated to let you know that
measurements have been lost.
•
When Accepted: Not while INITiated
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
mode discrete (string) BLOCk | OVERwrite none