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Subject: ASYN: slow GPIB
From: Michael Ritzert <michael.ritzert@ziti.uni-heidelberg.de>
To: tech-talk@aps.anl.gov
Date: Thu, 2 Jan 2014 14:17:16 +0100
Hi all!

I'm interfacing to a Keithley 2602 SMU with ASYN+linux-gpib. The
communication is working is principle, but it's awfully slow. I set the
record to scan every 2 seconds, and this is what I get from asynTrace:

2014/01/02 14:04:14.246 L0 addr 3 gpibPortWrite
print(smua.measure.i())\n
InternalReceiveSetup: command failed
2014/01/02 14:04:25.202 L0 addr 3 : EDVR 0: OS error.
2014/01/02 14:04:25.202293 L0 iocgpib:currentStep: asynError in read: L0 readGpib failed EDVR 0: OS error
2014/01/02 14:04:25.202360 L0 iocgpib:currentStep: I/O error after reading 0 bytes: ""
2014/01/02 14:04:25.202391 L0 iocgpib:currentStep: Protocol aborted
2014/01/02 14:04:43.033 L0 addr 3 gpibPortWrite
print(smua.measure.i())\n
2014/01/02 14:04:52.270 L0 addr 3 gpibPortRead
1.78814e-12\n
2014/01/02 14:05:45.841 L0 addr 3 gpibPortWrite
print(smua.measure.i())\n
2014/01/02 14:06:26.754 L0 addr 3 gpibPortRead
-3.36170e-12\n
2014/01/02 14:06:34.490 L0 addr 3 gpibPortWrite
print(smua.measure.i())\n
2014/01/02 14:06:53.271 L0 addr 3 : device timed out.
2014/01/02 14:06:53.270555 L0 iocgpib:currentStep: No reply from device within 1000 ms
2014/01/02 14:07:21.524 L0 addr 3 gpibPortWrite
print(smua.measure.i())\n
2014/01/02 14:08:59.935 L0 addr 3 gpibPortRead
4.32730e-12\n

Note the time of up to 40 seconds between read and write. The result is
correct in the end, but it's not reliable as you can see from the error
messages.

I'm using a NI USB HS GPIB adapter. Using ibtest to access the device works
as expected, i.e. with the response immediately available.

Does anybody know this problem (and a fix), or what can I do to debug
further?

Regards,
Michael

PS: more on the configuration: gpib.conf:
interface {
        minor = 0       /* board index, minor = 0 uses /dev/gpib0, minor = 1 uses /dev/gpib1, etc. */
        board_type = "ni_usb_b" /* type of interface board being used */
        name = "L0"     /* optional name, allows you to get a board descriptor using ibfind() */
        pad = 0 /* primary address of interface             */
        sad = 0 /* secondary address of interface           */
        timeout = T3s   /* timeout for commands */

        master = yes    /* interface board is system controller */
        eos = 0x0a      /* EOS Byte, 0xa is newline and 0xd is carriage return */
        set-reos = yes  /* Terminate read if EOS */
        set-bin = no    /* Compare EOS 8-bit */
        set-xeos = no   /* Assert EOI whenever EOS byte is sent */
        set-eot = yes   /* Assert EOI with last byte on writes */
}


yourdev.proto (I started with the example on the web):
Terminator = LF;

getCurrentStep {
        out "print(smua.measure.i())";
        in "%f";
}

DB file:
record (ai, "$(P)currentStep")
{
   field (SCAN, "2 second")
   field (DTYP, "stream")
   field (INP,  "@yourdev.proto getCurrentStep $(PORT) $(ADDR)")
}

call to GPIB init in st.cmd:
GpibBoardDriverConfig("L0", "1", "0" "3", "0")
-- 
Michael Ritzert                       Tel: +49 621 181 2883
Schaltungstechnik und Simulation      Fax: +49 621 181 2734
Technische Informatik, Uni Heidelberg michael.ritzert@ziti.uni-heidelberg.de
68131 Mannheim, Germany               http://sus.ziti.uni-heidelberg.de

Replies:
RE: ASYN: slow GPIB Mark Rivers

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