f.3.1.4 [format]
The "format" blockdefines how the Model395expects
to
receive the data from the DSO.
If
an item is left out
of
the "format' block, the Model 395 uses the default value (displayed
first on the list in bold). Every DSO driver file must contain a "format" block.
The "format" command contains these commands:
arder
size
dsize
dsign
counLtype
count_size
btype
format
or
der
This item defines the order
in
which the Model 395 expects the waveform data: MSB
or LSB. "order
=MSB:"
most significant byte fust; "arder= LSB:" leastsignificant byte
first.
size
This item defines the number
of
bytes per data point:1 or 2. "size 1:" selects 1 byte
per data point; "size 1:" selects 2 bytes per data point.
dsize
This item defines the data size. "dsize 8," selects 8 bitdata; "dsize = 12," selects
12
bit data;
or
"dsize = 16," selects 16 bit data.
dsign
This item defines signed or unsigned data. "dsign 0:" selects unsigned data. "dsign
= 1:" selects signed
2's
complement data
counCtype
This item determines the type
of
data found
in
the <count> field.
There
are three
counLtypes:
1 There is no <count> field, and the count is fixed. The expected number
of
data
bytes to
be
received is specified by the counLsize parameter.
4 <count>, a
binar'J number (NUM), represents the number
of
bytes remaining
in
the transfer.
Ta
find the
number
of
data
points
in
the
waveform,the
calculation is:
(NUM any <skip=n> fields between <count> and <end»
~
size
The number
of
bytes in
NUM
is specified by counLsize parameter (should he
1
or
2).
If
counLsize =2, then the "order" specifies the
msb
position.
5 <count> is specified in the 488.2 Definite Length Arbitrary Block Response
Format (paragraph 5.8). <count> is specified in a series
of
bytes as follows:
# Signifies the start
of
the count field.
numdigs
An
ASCII digit specifies how many digits in the count
digl
.,.
digN The actual digits for the count, in ASCII format
Example
#3256 means connt =256.
The derived count number (example
=256) represents
the
number
of
bytes
"remaining in the
transfer".
See
counctype
4
for
a
description
of
the
relationship between: "remaining bytes
in
transfer" and
"number
of
points
in
waveform."
F-6
DSa
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