Sorry, is nnn a number of expected bytes/characters? I haven't found any
explanation on the %c converter with this option on the official
StreamDevice web-site.
My incoming image has a variable length from 10kB up to 46kB. So in my
case how should I write the protocol? Maybe until the \n character?
Remember you proposed setting a big timeout and a "" separator? Will
that work?
I have also found the %#s converter. Perhaps, try this?
I am using RS232 rather than GPIB, but I wait ~ 10 seconds to get a
14-20kB file when getting the image by means of Python.
On Wed, May 2, 2012 at 7:32 PM, Rod Nussbaumer <[email protected]
<mailto:[email protected]>> wrote:
The %c converter should do it, along with a 'width' number of
expected characters (nnn in the example below). If this is to read
an unknown number of bytes, then the 'nnn' quantity will result in a
timeout to terminate the read. You would want to use @readtimeout to
set some reasonable number for that timeout.
I've used this method for reading binary formatted scope waveforms
where the number of bytes in the waveform is known a priori, but
never for reading a block of unknown size. There does seem to be an
as yet unresolved performance issue in streamDevice when the asyn
port driver is linuxGPIB, in case that is your architecture. I ended
up using a bare asyn record with DTYP=asynOctetCommandResponse to
solve it, coupled with a subroutine record to strip off an un-needed
header and perform a converison to multi-byte words.
> PrtScr {
> InTerminator = "";
> ReplyTimeout = 15000;
> out "HARDCOPY START";
> in "%nnnc";
^^^^
> }
--- rod.
Pavel Masloff wrote:
Hey Rod,
Which IN converter should I use in the protocol file of
StreamDevice?
I have tried %u and it didn't work:
record(waveform, "$(P)$(R)file") {
field(DTYP, "stream")
field(SCAN, "Passive")
field(INP, "@devTPS20xx.proto PrtScr $(PORT) $(A)")
field(NELM, "500000")
field(FTVL, "UCHAR")
}
PrtScr {
InTerminator = "";
ReplyTimeout = 15000;
out "HARDCOPY START";
in "%u";
}
L1 TPS2024B:file: Input
"BM╩7<00><00><00><00><00><00>__6<04><00><00>(<00><00><00>@<__01>..."
does
not match format %u
On Mon, Apr 30, 2012 at 12:24 AM, Rod Nussbaumer <[email protected]
<mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>> wrote:
In principle, you should be able to read the binary data
just as if
you were receiving a binary formatted waveform. The EPICS
waveform
record will need to be set to an unsigned char data type.
The trick
will be to properly handle ending the transmission. Since your
Python code seems to use a timeout to determine the end of
the file,
you could do that in streamDevice, too, by setting '
InTerminator =
"" ' & setting some reasonable number for the 'ReadTimeout' in the
protocol for the image file reader. Perhaps Dirk can confirm
this.
You will need to set the NELM field to something large enough to
hold the largest image file that can be transmitted. I do
not know
how you could automatically get the image data from the waveform
record into a file without some assistance from a host-based
tool.
Rod Nussbaumer
ISAC Controls, TRIUMF
Vancouver, Canada.
Pavel Masloff wrote:
Why can't I?
In Hyperterminal (as well as in Python) you simply send a
command and
receive bytes, which you forward to a binary file. Sth
like this:
|import sys
import os
import time
import serial
# create target file
print os.getcwd()
f = open('hardcopy.png', 'wb')
# configure the serial connection
ser = serial.Serial()
ser.port = 0
ser.timeout = 0
ser.baudrate = 9600
ser.open()
# configure the hardcopy settings
cmd = ':HARDCOPY:FORMAT PNG;PALETTE NORMAL;PORT RS232;LAYOUT
PORTRAIT;\
PREVIEW 0;INKSAVER 0;COMPRESSION 0\n'
a = ser.write(cmd)
print "bytes sent: {:d}".format(a)
# start hardcopy
a = ser.write("HARDCOPY START\n")
print "bytes sent: {:d}".format(a)
# begin receiving data and writing to file
total_bytes = 0;
a = ser.inWaiting()
while a>0:
time.sleep(0.5)
data = ser.read(a)
total_bytes += a
f.write(data)
time.sleep(0.5)
a = ser.inWaiting()
sys.stdout.write(".")
# close file and serial port
sys.stdout.write("\n")
f.close()
ser.close()
print "bytes read: {:d}".format(total_bytes)
print "script completed"|
Are you sure StreamDevice won't write the input to a
waveform
record?
On Sun, Apr 29, 2012 at 7:47 PM, Mark Rivers
<[email protected] <mailto:[email protected]>
<mailto:[email protected].__edu
<mailto:[email protected]>>
<mailto:[email protected]. <mailto:[email protected].>____edu
<mailto:[email protected].__edu
<mailto:[email protected]>>>> wrote:
I don't think you can get the image into a waveform
record
from the
scope with StreamDevice. You would have to write
another driver
that does what you were doing with Hyperterminal and
Python.
You
could perhaps use an SNL program for this.
To display an image in BOY you use the Intensity Plot
widget. The
waveform record is 1-D, but you tell the BOY widget the
actual X and
Y dimensions of the array.
Mark
____________________________________
From: Pavel Masloff [[email protected]
<mailto:[email protected]>
<mailto:pavel.masloff@gmail.__com <mailto:[email protected]>>
<mailto:pavel.masloff@gmail.
<mailto:pavel.masloff@gmail.>____com
<mailto:pavel.masloff@gmail.__com
<mailto:[email protected]>>>]
Sent: Sunday, April 29, 2012 9:22 AM
To: Mark Rivers
Cc: EPICS Tech Talk
Subject: Re: [Scopes] BMP image record??
Is there any working example on how to get the image
into a
waveform
record using StreamDevice? I haven't used the waveform
record yet,
reading up on this in the db reference manual, not that
comprehensible :(
Another question is how to read a waveform (image
type) in BOY?
Pavel
On Sat, Apr 28, 2012 at 5:53 PM, Mark Rivers
<[email protected] <mailto:[email protected]>
<mailto:[email protected].__edu
<mailto:[email protected]>>
<mailto:[email protected]. <mailto:[email protected].>____edu
<mailto:[email protected].__edu
<mailto:[email protected]>>><mailto:rivers@cars.
<mailto:rivers@cars.>__uch__icago.edu <http://uchicago.edu>
<mailto:[email protected].__edu
<mailto:[email protected]>>
<mailto:[email protected]. <mailto:[email protected].>____edu
<mailto:[email protected].__edu
<mailto:[email protected]>>>>> wrote:
If you can get the image into a waveform record, using
streamDevice
for example, then you can display that waveform as
in image
in EDM,
CSS BOY, ImageJ or other applications. You need to
create a few
other records that tell the client what the actual image
dimensions are.
It may be just as easy to implement reading the
actual waveforms
into waveform records, and display those with
Cartesian plot
widgets
in your display manager.
Mark
____________________________________
From: [email protected]
<mailto:[email protected]>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>
<mailto:tech-talk-bounces@aps.
<mailto:tech-talk-bounces@aps.>____anl.gov <http://anl.gov>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>><mailto:[email protected]
<mailto:[email protected]>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>
<mailto:tech-talk-bounces@aps.
<mailto:tech-talk-bounces@aps.>____anl.gov <http://anl.gov>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>>>
[[email protected]
<mailto:[email protected]>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>
<mailto:tech-talk-bounces@aps.
<mailto:tech-talk-bounces@aps.>____anl.gov <http://anl.gov>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>><mailto:[email protected]
<mailto:[email protected]>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>
<mailto:tech-talk-bounces@aps.
<mailto:tech-talk-bounces@aps.>____anl.gov <http://anl.gov>
<mailto:tech-talk-bounces@aps.__anl.gov
<mailto:[email protected]>>>>] on behalf of Pavel
Masloff
[[email protected]
<mailto:[email protected]>
<mailto:pavel.masloff@gmail.__com <mailto:[email protected]>>
<mailto:pavel.masloff@gmail. <mailto:pavel.masloff@gmail.>____com
<mailto:pavel.masloff@gmail.__com
<mailto:[email protected]>>><mailto:pavel.masloff@
<mailto:pavel.masloff@>__g__mail.com <http://gmail.com>
<mailto:pavel.masloff@gmail.__com <mailto:[email protected]>>
<mailto:pavel.masloff@gmail. <mailto:pavel.masloff@gmail.>____com
<mailto:pavel.masloff@gmail.__com
<mailto:[email protected]>>>>]
Sent: Saturday, April 28, 2012 2:17 AM
To: EPICS Tech Talk
Subject: [Scopes] BMP image record??
Hello again,
As I mentioned earlier we are running a series of
experiments with
our high current switches. I have written simple support
("...with a
little help from my friend" Dirk Zimoch) for the
Tektronix
TPS2000
over RS232 using StreamDevice and ASYN, so now I can
remotely arm
the scopes, set its properties, save waveforms on to
the CF
card,
etc. But...
In order to not run back and forth and see if
everything went OK
(which is rather tiresome and time consuming), we need a
confirmation from the scopes. I don't want to deal
with the
implementation of the waveform records for now, all
I have
got so
far is that I save them on the flash card.
As such a confirmation I see transferring the BMP
(or PNG) image
from the scope (sort of Print screen) on to the
operator PC
somehow.
There is a special SCPI command "Hardcopy start". Which
mimics the
Print button on the scope's front panel. I have tried to
transfer a
BMP file via Hyperterminal (and Python script) and
it worked out
well (more or less).
How could this be ported to the EPICS database from
the IOC and
client standpoint, so an operator could see the
oscillogram
on the
screen and decide whether the experiment went well,
so she
will save
the waveforms and move on to the next experiment?
The image file is maximum ~ 46Kb (20Kb on average).
Any thoughts?
--
Best regards,
Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia
Mobile: +7 (951) 672 22 19
Landline: +7 (812) 461 01 01
--
Best regards,
Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia
Mobile: +7 (951) 672 22 19
Landline: +7 (812) 461 01 01
--
Best regards,
Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia
Mobile: +7 (951) 672 22 19
Landline: +7 (812) 461 01 01
--
Best regards,
Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia
Mobile: +7 (951) 672 22 19
Landline: +7 (812) 461 01 01
--
Best regards,
Pavel Maslov, MS
Controls Engineer at Pulsed power Lab
Efremov Institute for Electro-Physical Apparatus
St. Petersburg, Russia
Mobile: +7 (951) 672 22 19
Landline: +7 (812) 461 01 01
