Experimental Physics and
Industrial Control System

From: Ritesh Sugandhi [mailto:[email protected]]
Sent: November-30-10 7:53 AM
To: [email protected]
Cc: [email protected]; [email protected]; 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