Experimental Physics and
Industrial Control System

Mark Rivers <[email protected]> · Mon, 29 Aug 2016 13:03:55 +0000

> Doesn’t matter, the easiest way to configure this is still to leave EPICS_CAS_SERVER_PORT undefined
> since the clients will find all your IOCs just fine.

The only exception to this is if your clients are on a different subnet from your IOC.  In that case I believe you can use a PV gateway, or set the PCAS server port manually and set EPICS_CA_ADDR_LIST on the client.

Mark

________________________________
From: [email protected] [[email protected]] on behalf of Kasemir, Kay [[email protected]]
Sent: Monday, August 29, 2016 7:45 AM
To: geyang
Cc: [email protected]
Subject: Re: question about pcaspy

Hi:

If you want to run multiple copies of the pcaspy CA server on one computer, it’s really the same as running multiple soft IOCs on the same computer.
You don’t need to change any port settings.
All copies of the CA server on the host will listen to UDP name searches on the default UDP port.
They cannot all use the same default TCP port, so except for the first server that you start you’ll see the warning messages “css warning: Configured TCP port was unavailable. Using dynamically assigned ..” but that’s not a problem.

What happens on the protocol level:
Clients search for a channel.
CAS replies: I have that channel, talk to me on TCP port xxxxxx.
For the first CAS that you start, that TCP port is the default, for the rest it’s a different port.
Doesn’t matter, the easiest way to configure this is still to leave EPICS_CAS_SERVER_PORT undefined since the clients will find all your IOCs just fine.

See also https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Configure_Channel_Access<redir.aspx?REF=K4w4oV4e7nMp4yQsH0uQtCKJQEqNIdY2XwxaEpynxnFy8TKhDNDTCAFodHRwczovL3dpa2ktZXh0LmFwcy5hbmwuZ292L2VwaWNzL2luZGV4LnBocC9Ib3dfdG9fQ29uZmlndXJlX0NoYW5uZWxfQWNjZXNz>

-Kay

On Aug 27, 2016, at 8:45 PM, geyang <[email protected]<redir.aspx?REF=NLRaXEcDSU9WoIHBsGBGzIvQzStBK08Uw7P2t--m2ahy8TKhDNDTCAFtYWlsdG86bWFyY29faGFpckAxNjMuY29t>> wrote:

hi,

  I would like to ask if  SimpleServer's port can be changed to others in code, such as 5066/5068? For example, I have a device driver written by pcaspy, I want to implement the same driver for many same type devices on one machine, then I need to set them different server ports.
  thanks a lot for your help.

Best wishes
Geyang 2016/8/28

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System