Re: linux-gpib with asyn

[Peter.Mueller@ptb.de]

Hi Stuart,

we have recently set up a small linux box with ines_pci_gp5130 board.
See the small snipped from st.cmd how we call GpibBoardDriverConfig

#  GpibBoardDriverConfig(portName,autoConnect,BoardIndex,timeout,priority)
GpibBoardDriverConfig("L1",1, 0, 3.0, 0)

and content of file gpib.conf of that box:

more /etc/gpib.conf
/***********************************************************************
                  GPIB.CONF
IEEE488 library config file
                    
         -------------------

    copyright            : (C)
2002 by Frank Mori Hess
                    
      (C) 1994 by C.Schroeter
    email                :
fmhess@users.sourceforge.net
 
***************************************************************************/
/***************************************************************************
  *
  *   Syntax:
  *
  *         interface { ... } starts new interface
board section
  *         device {...} device configuration
  *
 
***************************************************************************/


interface {
         minor = 0
         board_type = "ines_pci_gp5130"
         name = "L1"
         pad = 0
         sad = 0
         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 */
         master = yes
}


We have connected instruments of different vendors to the bus: Keithley,
HP, Datron and we also get replies where the first character is NULL. We
never saw this on an E5810 LAN-GPIB gateway, thus it must be due to the
board or linux-gpib driver.

Currently we are using epics 3.14.12.1 and asyn 4-16
What sw releases and kind of board are you using?

Regards

Peter

Am 09.01.2012 14:28, schrieb Wilkins, Stuart:
> Hi!
>
> I have been using linux-gpib and asyn (and StreamDevice) for
> communication with Keithley Electrometers. I have one comment on the
> documentation and one bug which I would like to see if anyone else
has seen.
>
> Firstly, according to the asyn documentation the following command
at
> the iocsh sets up the board.
>
> GpibBoardDriverConfig(portName,autoConnect,BoardIndex,timeout,priority)
>
>  From this documentation, it looks like you assign the GPIB board
with
> the integer "board index", however after about 2 hrs of
trying to get
> this working, I delved into the souce code for this driver. In fact,
> this is not the behavior in the code, the port driver tries to open
the
> gpib card with the same name as the portName as defined in
> /etc/gpib.conf. I think (although in places the code is fairly cryptic)
> it is only if you open a certain gpib address that it uses board index,
> but I cannot find the config to give the primary and secondary address
> at the iocsh. It might be a good idea to update this in the asyn
> documentation (or at least clarify it!)
>
> Having got past this stage, I noticed that some of my communications
are
> being garbled, with replies returning where the first character is
NULL
> [chr$(0)] instead of the correct character. Has anyone seen this
> behavior. I am not sure if it is due to the linux-gpib driver, asyn
or
> the Keithley. I plan to put another device on the bus to see if it
is
> just this combination. Is anyone out there using this combination?
>
> Best wishes,
> Stuart

==================================================================================
phone:        +49
30 3481 7111
fax:        +49
30 69 3481 7111
eMail:        peter.mueller@ptb.de

Postalische Anschrift / mailing address:
       |        Besucheranschrift
/ Visitors address:
        |
Peter Müller        |
in        |
Physikalisch-Technische Bundesanstalt
       |        Helmholtzzentrum
für Materialien und Energie
O.E. 7.11 Röntgenradiometrie  
     |        Wilhelm-Conrad-Röntgen
Campus
Abbestraße 2-12      
 |        Albert-Einstein-Straße
15
D-10587 Berlin      
 |        12489 Berlin
==================================================================================