Hi Pierr-Andre,


> Hi Dawei,
> 
> Could you give more info on your setup:
> - CAMAC controller model

Jorway 73A, we have three in hand and the problem doesn't depend on which controller
we were using.

> - ADC model

LeCroy 2249W. We also tried two other modules LeCroy 2249A. Same problem.

> - LAM setting

The poll and ADC reading codes are basically from Midas distribution.

> - Mode of polling (on module or on CC)

Polling on CC. I also tried to add a timeout code reading ADC, didn't solve the problem.

> - Are you still going through the poll_event() after hang up?

That's I don't know. I believe the problem happens between finishing reading one event
and passing the control back to poll_event.

> - Do you have the same problem at low rate (100Hz)?

The rate we are currently running is about 400 Hz, it has the same problem. We will
try lower rate more.

Thanks,

Dawei

> 
> Pierre-André
> > Hi,
> > 
> > We are using midas to read ADC. It sometimes hung in the middle of data taking.
> > We tried to disable analyzer and only run with frontend. The problem still
> > exists. We tried to use different crate, different CAMAC controller and
> > different ADC module. All these did not solve the problem. We use polled method
> > to read data. We have dataway display unit so we know that it hung always after
> > it executed CAMAC command F9, which is after finishing one data taking and clear
> > the ADC for the next data taking. The data rate is about 1 KHz. It is random for
> > how long it takes for the system to hang.
> > 
> > Any ideas ?
> > 
> > Thanks,
> > 
> > Dawei Liu