Experimental Physics and
Industrial Control System

Eric Norum <[email protected]> · Mon, 3 Nov 2008 08:32:13 -0600

On Nov 3, 2008, at 3:39 AM, Dirk Zimoch wrote:
Hi Zen,
.

.

.

ASCII is usually a quite inefficient encoding for huge waveforms.
Often devices offer a "raw" format, (e.g. 2 byte integer). This
format is not terminated because raw input may consist of CR LF
bytes. However, it has a fixed input length. Often is is prefixed by
a header that defines the input length. Unfortunately StreamDevice
cannot interpret this header. (This would be something for a asyn
interpose layer, I guess). But you can easily calculate the size
yourself. If the header looks like this "#800001000" the total input
size is 1010 (10+2*500). And you can use a format like this:

This format is an IEEE-488.2 standard. For an example of reading this
see the readArbitraryBlockProgramData() function in the ASYN devGpib
support (modules/soft/asyn/asyn/devGpib/devSupportGpib.c).

For an example of this function's use see the Tektronix TDS3000/5000
support (modules/instrument/tds3000/TDS3000/src/devTDS.c).

--

Eric Norum <[email protected]>

Advanced Photon Source

Argonne National Laboratory

(630) 252-4793

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System