Experimental Physics and
Industrial Control System

Ralph Lange <[email protected]> · Sat, 05 Apr 2014 15:31:12 +0200

On 04.04.2014 19:57, Kasemir, Kay wrote:

Hi:

I believe this is related to the general multiple-IOCs-on-same-computer problem, https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Configure_Channel_Access

With
  EPICS_CA_ADDR_LIST = IP-of-that-server
you only get the IOC that was started last.
Same with
  EPICS_CA_ADDR_LIST = 127.0.0.1
You get the local IOC that was started last on the local computer.

You must use
  EPICS_CA_ADDR_LIST = broadcast-address-that-includes-that-server
to get all IOCs that are running on a computer.

With
  EPICS_CA_ADDR_LIST = "127.0.0.1 broadcast-address-that-includes-myself"
you get all IOCs on the local computer, but it's likely going 'over the network', even for the local IOC, since it would only find one of them via 127.0.0.1.

Use the *broadcast address* of the loopback interface (127.255.255.255)

to get all local IOCs through that interface. 127.0.0.1 is the *unicast*

IP of localhost, so the restrictions of unicast addresses in

EPICS_CA_ADDR_LIST apply.

(Also see

https://wiki-ext.aps.anl.gov/epics/index.php/How_to_Make_Channel_Access_Reach_Multiple_Soft_IOCs_on_a_Linux_Host)

~Ralph

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System