RE: asyn connection management with asynPortDriver

["Mark Rivers" <rivers@cars.uchicago.edu>]

Hi Euan,
 
I am away from the lab, but I will look into this and get you an answer when I return on June 20.  It seems like the asyn record should do what you want, but maybe something is wrong.
 
Meanwhile perhaps Eric Norum can help :-)
 
Mark
 

________________________________

From: tech-talk-bounces@aps.anl.gov on behalf of Euan.Troup@csiro.au
Sent: Wed 6/8/2011 8:25 PM
To: tech-talk@aps.anl.gov
Subject: asyn connection management with asynPortDriver



Hi,

I would like to use the connection management features of asyn with a driver based on the asynPortDriver class. If I create the port driver class with the autoconnect flag set to true I can use the asynRecord CNCT field to connect or disconnect a device from the port. If autoconnect is set to false, then when the IOC starts up, the following messages appear:

iocRun: All initialization complete
epics> 2011/06/09 10:51:51.625 as:t:as01:drx:s1:asynRecord: queueRequest failed for special.
2011/06/09 10:51:51.625 as:t:as01:drx:s1:asynRecord: port drx1 not connected

If I try and use the CNCT field if the asyn record to connect a device then a similar message is produced:
epics> 2011/06/09 11:00:29.564 as:t:as01:drx:s1:asynRecord: exception 2
2011/06/09 11:00:39.172 as:t:as01:drx:s1:asynRecord: queueRequest failed for special.
2011/06/09 11:00:39.172 as:t:as01:drx:s1:asynRecord: port drx1 not connected

As I understand the setup, the asynPortDriver constructor will connect the port and the class methods connect() and disconnect() will connect  devices to the port. I have derived these methods in my class so that I can manage connections but without autoconnect to make the first connection these methods are not called. So even though the port is connected, without autoconnect I can't connect any devices to the port. I guess there is some setup I haven't performed. I would like advice as to how to manage the connections. I am using asyn 4.16 with EPICS 3.14.12.

cheers,

Euan.