Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	RE: Long out record PV Monitoring error in client using CaChannel-1.5 python interface
From:	"Wang Xiaoqiang" <[email protected]>
To:	"Ritesh Sugandhi" <[email protected]>, <[email protected]>
Cc:	Di Maio Franck <[email protected]>
Date:	Wed, 1 Dec 2010 09:56:09 +0100

What you mean by "When ever the record attends the –ive values"?

Are you using CaChannel 1.5 from http://sourceforge.net/projects/igor2epics/files/CaChannel/ ?

I did a test with your snippet, into which I have added the trivial missing imports. I have attached the script and database

My test system is:

Scientific Linux 5.1 x86

EPICS 3.14.8

Python 2.4.3

Here is the output. Could you run my attached script and post the output?

### IOC Log ####

slslc06> dbpf long 1234
DBR_LONG:           1234      0x4d2
slslc06> dbpf long 2147483647
DBR_LONG:           2147483647 0x7fffffff
slslc06> dbpf long 2147483648
DBR_LONG:           2147483647 0x7fffffff
slslc06>

#### Python Monitor ###

        2010-12-01 09:40:59
long    2010-12-01 09:40:59     0
long    2010-12-01 09:41:16     1234
long    2010-12-01 09:41:33     2147483647

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

Best,

Xiaoqiang

From: Ritesh Sugandhi [mailto:[email protected]]
Sent: Tuesday, November 30, 2010 4:53 PM
To: [email protected]
Cc: [email protected]; Wang Xiaoqiang; 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 –ive 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

Attachment: a.db
Description: a.db

Attachment: a.py
Description: a.py

References:: Long out record PV Monitoring error in client using CaChannel-1.5 python interface Ritesh Sugandhi

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ANJ, 01 Dec 2010

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System