6482-901-01 Rev. A / August 2012
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16-29
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
Section 16: SCPI Command Reference
Figure 16-2
IEEE-754 single precision data format (32 data bits)
During binary transfers, never un-talk the Model 6482 until after the data is read
(input) to the computer. Also, to avoid erratic operation, the readings of the data
string (and terminator) should be acquired in one piece. The header (#0) can be
read separately before the rest of the string.
NOTE
The
Model 6482
terminates the binary data string with LF + EOI. If your program is set to
terminate on CR and/or LF, data transfer may terminate prematurely because one or
more data bytes has a CR or LF value. To avoid the problem, set your computer program
to terminate on EOI only.
The number of bytes to be transferred can be calculated as follows:
Bytes = 2+(Rdgs
×
4) + 1
where 2 is the number of bytes for the header (#0).
Rdgs is the product of the number of selected data elements, arm
count, and trigger count.
4 is the number of bytes for each reading.
1 is the byte for the terminator.
For example, assume the Model 6482 is configured to perform 10 source and
measure operations and send the 10 current measurements to the computer
using the binary format.
Bytes = 2 + (10 x 4) + 1
= 43
Data elements
ELEMents <item list>
:FORMat:ELEMents [SENSe] <item list>Specify data elements for data string
Parameters
<item list> =CURRent[1]
Includes channel 1 current reading
CURRent2
Includes channel 2 current reading
TIME
Includes timestamp
STATus
Includes status information
NOTE
Each item in the list must be separated by a comma (for example, CURR1, CURR2,
TIME).
Query
:ELEMents?
Query elements in data string
s
# 0
7
0 7
0 7
0 7
0
e
f
Header
Byte 1
Byte 2
Byte 3
Byte 4
s = sign bit (0 = positive, 1 = negative)
e = exponent bits (8)
f = fraction bits (23)
Normal byte order shown. For swapped byte order, bytes sent
in reverse order: Header, Byte 4, Byte 3, Byte 2, Byte 1.
The header and terminator are sent only once for each READ?
Summary of Contents for 6482
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