Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Thu, 4 Jun 1998 22:59:23 +0900

Hi,

 Thank you Jeff. After I sent the previous e-mail, my colleague found that
reduced size of buffer area removed the problem. In the original program,
he used rather big array (20Kbytes) in the subroutine for reading data from VXI.
It was necessary at somepoint, but the current version can work with 
smaller buffer size.  And this version works very well.

Thanks again to all of you.

 Noboru YAMAMOTO
 KEKB control group
 KEK, JAPAN

=============================================================================
Jeff wrote:
>
>Noburo,
>
>As I recall, APS experienced some problems with the National Instruments
>MXI hardware timing out during VXI bus transfers when they first set up their 
>MXI systems. Ned Arnold ([email protected]) might be able to provide some hints on
>setting up MXI bus systems.
>
>Jeff

>On Tuesday, June 02, 1998 2:08 AM, Noboru Yamamoto [SMTP:[email protected]] wrote:
>> Hi,
>>  
>>  We are writing a device support routines for a VXI oscillo scope. We use
>> MXI-bus connection to cnnect VME bus, where IOC is, and VXI bus , where
>> an Osciloscope. When you satrted databse at one scanning period, the device
>> support works OK. Some records send commands to setup measurement and a
>> waveform record reads trace data from the osciloscope. 
>> However, we changes scanning period of the processing, IOC crashes.
>> Actually it freeze.
>>  
>>  Does anybody has a similar problem in developing device support? Which part
>> of device support we should look at?
>> 
>>  Your comments will be grately appricated.
>> 
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System