EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: Channel access over wireless?
From: Emmanuel Mayssat <[email protected]>
To: "[email protected]" <[email protected]>
Date: Thu, 31 Oct 2013 10:55:20 -0700
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?

Other possible architectures:
* mirroring of IOC
 local OPI --- (CA)--- local IOC -----(CA over wireless?) ---- remote IOC
How can you mirror an IOC, PV to PV ? (PV names need not be the same)

* 2 processes with duplicate queries
local OPI ---(CA)--- local IOC ----(serial protocol over wireless) ---- controller to remote hardware 
The remote IOC is independent from above and need to query the hardware as well
Maybe IPC could help reduce the number of 'real' queries?

* custom development (with Robot OS, aka ROS, or equivalent)
local OPI ---(CA)-- local IOC --- (serial protocol over wireless)--- non IOC software, i.e ROS
Make sense, but learning curve...

Any input?

--
Emmanuel






Replies:
RE: Channel access over wireless? Dalesio, Leo
Re: Channel access over wireless? Ralph Lange

Navigate by Date:
Prev: Re: merge multiple alarms Tito Körner
Next: RE: Channel access over wireless? Dalesio, Leo
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: RE: Asyn asynDrvUser interface Mark Rivers
Next: RE: Channel access over wireless? Dalesio, Leo
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 20 Apr 2015 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·