Experimental Physics and
Industrial Control System

Hinko Kocevar <[email protected]> · Thu, 02 Jun 2011 10:48:48 +0200

Fixing example.. still same result:

import epics
import time
import sys

def onConnectionChange(pvname=None, conn=None, chid=None):

 print 'ca connection status changed: ', time.time(), pvname,

conn, chid

    sys.stdout.flush()

# create channel, provide connection callback
pv1 = 'HINKS:ENV:ENV_VOLTAGE1_MONITOR'

chid1 = epics.ca.create_channel(pv1, connect=False,

callback=onConnectionChange)

# create channel, provide connection callback
pv2 = 'HINKS:ENV:ENV_VOLTAGE2_MONITOR'

chid2 = epics.ca.create_channel(pv2, connect=True,

callback=onConnectionChange)

time.sleep(1)
print "ca._cache:", epics.ca._cache

print 'Now waiting, watching values and connection changes:'
t0 = time.time()
while time.time()-t0 < 30:
    time.sleep(0.001)

print "Exiting .."

Output:
$ python caconnect.py

ca connection status changed: 1307004453.64

HINKS:ENV:ENV_VOLTAGE1_MONITOR True 157644296

ca connection status changed: 1307004453.64

HINKS:ENV:ENV_VOLTAGE2_MONITOR True 157644328

ca._cache: {155204176: {'HINKS:ENV:ENV_VOLTAGE2_MONITOR': {'callbacks':

[<function onConnectionChange at 0x9591cdc>], 'failures': 0, 'chid':

157644328, 'conn': True, 'ts': 1307004453.635572},

'HINKS:ENV:ENV_VOLTAGE1_MONITOR': {'callbacks': [<function

onConnectionChange at 0x9591cdc>], 'failures': 0, 'chid': 157644296,

'conn': True, 'ts': 1307004453.635221}}}

Now waiting, watching values and connection changes:
Exiting ..

--
Hinko Kocevar
Technical support software engineer
Instrumentation Technologies
Velika pot 22, SI-5250 Solkan - Slovenia
T:+386 5 3352600, F:+386 5 3352601
mailto: [email protected]

http://www.i-tech.si - When your users demand stability

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System