Experimental Physics and Industrial Control System
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On 31.10.2013 18:55, Emmanuel Mayssat
wrote:
I am contemplating a project which requires
wireless communication.
I would like to have telemetry information on a control station.
The network link specification is: range 1 mile at 250Kbps
Latency could definitely be an issue (measurement needed at this
point)
I could potentially have several 250Kpbs links (not sure whether
they can be 'trunked' together)
The remote device could run an IOC (I need something like a
'fast' sequencer for sure)
Between local OPI and remote IOC, I can use any communication
protocol I want
Classic architecture:
local OPI ---- (CA over wireless) --- remote IOC
is there a way for an OPI to bypass the UDP discovery process
and force connection to a specific IP addres/port?
Setting EPICS_CA_AUTO_ADDRESS=NO suppresses the UDP broadcast
Setting EPICS_CA_ADDRESS_LIST restricts discovery traffic to a list
of IP/port addresses
Setting EPICS_CA_NAME_SERVERS uses TCP for discovery traffic to a
list of IP/port addresses
Setting both
EPICS_CA_AUTO_ADDRESS=NO
EPICS_CA_NAME_SERVERS=your.destination.ip.address:port
will run Channel Access exclusively to that server/port, using TCP
for name resolution and data.
You could e.g. use this to tunnel CA through SSH.
You can find more information in the Channel Access Reference
Manual.
HTH,
~Ralph
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- RE: Channel access over wireless? Mark Rivers
- RE: Channel access over wireless? Hill, Jeff
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ANJ, 20 Apr 2015 |
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