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2600S-901-01 Rev. C / January 2008
Section 12: Instrument Control Library
Series 2600 System SourceMeter® Instruments Reference Manual
format.byteorder
Attribute
The binary byte order for data printed using the
printnumber
and
printbuffer
functions.
Usage
order = format.byteorder
-- Reads byte order.
format.byteorder = order
-- Writes byte order.
Set
order
to one of the following values:
0
or
format.NORMAL
Most significant byte first.
0
or
format.BIGENDIAN
Most significant byte first.
0
or
format.NETWORK
Most significant byte first.
1
or
format.SWAPPED
Least significant byte first.
1
or
format.LITTLEENDIAN
Least significant byte first.
Remarks
• This attribute selects the byte order that data is written when printing data values with th
e
printnumber
and the
printbuffer
function
s. The byte order attribute is only used
with the SREAL, REAL, REAL32, and REAL64 data formats.
• NORMAL, BIGENDIAN, and NETWORK select the same byte order. SWAPPED and
LITTLEENDIAN select the same byte order. They are alternative identifiers. Selecting
which to use is a matter of preference.
• Select the SWAPPED or LITTLEENDIAN byte order when sending data to an IBM PC
compatible computer.
Also see
,
Example
Selects the SWAPPED byte order:
format.byteorder = format.SWAPPED
format.data
Attribute
The data format for data printed using the
printnumber
and
printbuffer
function
s.
Usage
fmt = format.data
-- Reads data format.
format.data
= fmt
-- Writes data format.
Set
fmt
to one of the following values:
1
or
format.ASCII
ASCII format.
2
or
format.SREAL
Single precision IEEE-754 binary format.
2
or
format.REAL32
Single precision IEEE-754 binary format.
3
or
format.REAL
Double precision IEEE-754 binary format.
3
or
format.REAL64
Double precision IEEE-754 binary format.
Remarks
• This attribute selects the data format used to print data values with the
printnumber
and
printbuffer
functions.
• The precision of the ASCII format can be controlled with the
attribute. The byte order of SREAL, REAL, REAL32, and REAL64 can be selected with
the
attribute.
• REAL32 and SREAL select the same single precision format. REAL and REAL64 select
the same double precision format. They are alternative identifiers. Selecting which to use
is a matter of preference.
• The IEEE-754 binary formats use 4 bytes each for single precision values and 8 bytes
each for double precision values.
• When data is written with any of the binary formats, the response message will start with
“#0” and end with a new line. When data is written with the ASCII format, elements will be
separated with a comma and space.
Also see
,
Example
Selects the ASCII data format:
format.data = format.ASCII
