5-52 Remote Operation
The byte count is twice the number
of
points ta be downloaded ta the trace. The byte
count must exactly correspond to the number
of
bytes in the block
of
data. Each data
ward is a two byte ward representing a 12-bit binary unsigned integer between 0 and
4095.
Prior to downloading a Waveform using the IRACe[:DATA] <trace_name>,<block>
command, the Trace must be fust reserved in the channel memory.
As an example, the command:
IRACe:DATA
wavel,
#3800
would begin the transfer
of
800 bytes
of
data (400 points)
ta
the Mode1395, trace
"wavel." Exactly 800 bytes
of
data must directly follow.
Send the IRACe:DEFine <trace_name>,<value> command
ta
reserve trace memory
of
<value> points under the <trace_name>. This also presets the Trace Lirnits for this
trllc:e
lit
1'1111
size. Yon
mllY
select a segment ofthis trace for download (or subsequently,
for upload) using the TRACe:LIMits <trace_name>,<starcindex>,<stop_ index>
commando
NOTE
When
the
block size exceeds the capability
of
your download
or
upload application, you may use the IRACe:LIMits feature to break
the block
up
into manageable segments.
The "binary" transfer using tItis format occurs
at
a relatively high speed because the
binary data is not parsed through the Command Processor. Instead, the binary data is
routed directly to channel memory without processing
or
lirnit checking, much like a
direct memory access (DMA).
If
the waveform lirnits (size), the byte count or the number
of
bytes
in
the <block> are
not all
in
numeric agreement, or one half second elapses without receiving any data,
the high speed transfer will be aborted.
Any data received after this will be interpreted by the Command Processor as ASCII
characters and may cause the Model 395 to
act
unpredictably. Because
of
this low
tolerance for errors, the high speed waveform transfer method should
be
used with
extreme care.
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