RE: Long out record PV Monitoring error in client using CaChannel-1.5 python interface

["Pam Gurd" <pamgurd@shaw.ca>]

The code may interpret long values as unsigned integers. Â(In some cases, that might be what you would want.)Â ÂIt will take me some time to be able to look at this.

 

 Pam.

 

From: Ritesh Sugandhi [mailto:ritesh.sugandhi@gmail.com]
Sent: November-30-10 7:53 AM
To: tech-talk@aps.anl.gov
Cc: pamgurd@shaw.ca; xiaoqiang.wang@psi.ch; Di Maio Franck
Subject: Long out record PV Monitoring error in client using CaChannel-1.5 python interface

 

Dear Sir,

 

We are using a client application develop using CaChannel-1.5 epics python interface library. The CA server is exposing a longout record which we are interested in monitoring.  When ever the record attends the âive values. The client shows  2**32-val instead of value. while the same code works well with ao record type .

 

The Code is as below:

 

###################################################

 

def eventMon(epics_args, user_args):

  global monPV, now

  print monPV, now, epics_args['pv_value']

 

def main():

  global stop, now

  try:

    monChan = CaChannel()

    monChan.search(monPV)

    monChan.pend_io()

    print now

  except CaChannelException, status:

    print ca.message(status)

  try:

    monChan.add_masked_array_event(ca.dbf_type_to_DBR_STS(monChan.field_type()), \

          None, ca.DBE_VALUE | ca.DBE_ALARM, eventMon)

  except CaChannelException, status:

    print ca.message(status)

  while not stop:

    now = strftime('\t%Y-%m-%d %X\t')

    ca.pend_event(0.5)

 

###################################################

 

Best Regards,

 

Ritesh Sugandhi 

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