Experimental Physics and
Industrial Control System

[email protected] · Tue, 21 Sep 2010 22:27:50 -0700

Hello,

I have been using epics and python for quite some time now.
Just recently I moved to the excellent pyepics.
The only issue... long type PVs!
I am about to upgrade to the latest version (pyepics 3,0,8) since I am using an older one (3.0.1)

But here is what I see:

epics2@cr1com1 $ caget DMC2183:1:AEncdrPstnLI
DMC2183:1:AEncdrPstnLI         -1833

in python:
-------> print(pv.info)
== DMC2183:1:AEncdrPstnLI  (long) ==
   value      = 4294965463
   char_value = 4294965463
   count      = 1
   type       = long
   units      = Steps
   host       = cls1ir-eth0:5064
   access     = read/write
   status     = 0
   severity   = 0
   timestamp  = 1285131880.264 (2010-09-21 22:04:40.263942)
   upper_ctrl_limit    = 0
   lower_ctrl_limit    = 0
   upper_disp_limit    = 0
   lower_disp_limit    = 0
   upper_alarm_limit   = 0
   lower_alarm_limit   = 0
   upper_warning_limit = -7872675053568
   lower_warning_limit = 0
   PV is internally monitored, with 0 user-defined callbacks:
=============================

Notice the reported value as ...
   value      = 4294965463

It seems there is an issue with bit ordering.
It works well for double records though.s ;-)

Based on the pdf doc, the maintainer is Matthew Newville at U Chicago.
Is he on the mailing list? Anyone knows how to contact him?
I should have contacted him a long time ago....

Best,
--
Emmanuel

- 
Emmanuel

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System