Re: StreamDevice/ASYN connection to a Telnet port

[Dimitrios Tsifakis <Dimitrios.Tsifakis@anu.edu.au>]

Hello John,

I have seen the same behavior recently, while trying to produce drivers
for a home-made scaler connecting to EPICS through a serial port. The
solution was to define very carefully all the timing as well as the
terminator parameters in the protocol file. Here is what mine looks
like:

InTerminator = ;
ExtraInput = Ignore;
OutTerminator = CR;
ReplyTimeout = 500;
ReadTimeout = 10;
PollPeriod = 10;

These values were determined after some experimentation and seem to
produce the desirable behavior in my case. I would suggest you have a
read at the EPICS StreadDevice documentation, especially the section
titled "System Variables" that describes the use of these variables.

Hope this helps,
Dimitris


On Tue, 2011-01-18 at 12:00 -0600, tech-talk-request@aps.anl.gov wrote:
> Date: Mon, 17 Jan 2011 16:23:00 -0500
> From: John Dobbins <john.dobbins@cornell.edu>
> To: EPICS Tech-Talk <tech-talk@aps.anl.gov>
> Subject: StreamDevice/ASYN connection to a Telnet port
> Message-ID:
> 	<8C7BE07847F60A4FB9DF545CFFBC2D8C35039B5C37@MBXC.exchange.cornell.edu>
> Content-Type: text/plain; charset="us-ascii"
> 
> Dear All,
> 
> I am connecting to a Gamma Vacuum SPCe ion pump power supply. This device has an ethernet port which accepts telnet connections.
> 
> I set up StremDevice to communicate with it on port 23,
> 
> I have  asyn Trace Masks set as follows:
> 
> asynSetTraceMask("SPCe",-1,0x09)
> asynSetTraceIOMask("SPCe",-1,0x2
> 
> I have a problem in that the response string , which I expect to look like  "OK 00 7.90E-13 TORR" 
> 
> appears like this:
> 
> 
> epics> 2011/01/17 16:14:55.995 172.18.32.21:23 write 7
> spc 0B\r
> 2011/01/17 16:14:56.475 172.18.32.21:23 read 1
> O
> 2011/01/17 16:14:56.475 172.18.32.21:23 read 1
> K
> 2011/01/17 16:14:56.475 172.18.32.21:23 read 1
>  
> 2011/01/17 16:14:56.475 172.18.32.21:23 read 1
> 0
> 2011/01/17 16:14:56.475 172.18.32.21:23 read 1
> 0
> 2011/01/17 16:14:56.476 172.18.32.21:23 read 1
>  
> 2011/01/17 16:14:56.476 172.18.32.21:23 read 1
> 7
> 2011/01/17 16:14:56.476 172.18.32.21:23 read 1
> .
> 2011/01/17 16:14:56.476 172.18.32.21:23 read 1
> 9
> 2011/01/17 16:14:56.477 172.18.32.21:23 read 1
> 0
> 2011/01/17 16:14:56.477 172.18.32.21:23 read 1
> E
> 2011/01/17 16:14:56.477 172.18.32.21:23 read 1
> -
> 2011/01/17 16:14:56.477 172.18.32.21:23 read 1
> 1
> 2011/01/17 16:14:56.478 172.18.32.21:23 read 1
> 3
> 2011/01/17 16:14:56.478 172.18.32.21:23 read 1
>  
> 2011/01/17 16:14:56.478 172.18.32.21:23 read 1
> T
> 2011/01/17 16:14:56.478 172.18.32.21:23 read 1
> O
> 2011/01/17 16:14:56.478 172.18.32.21:23 read 1
> R
> 2011/01/17 16:14:56.479 172.18.32.21:23 read 1
> R
> 2011/01/17 16:14:56.479 172.18.32.21:23 read 1
> \r
> 
> 
> Can someone tell me what is going on here?
> 
> Regards and thanks,
> 
> John Dobbins
> 
> Cornell University
> Lab for Elementary Particle Physics

-- 
===========================================================================
Mail: Dimitrios.Tsifakis@anu.edu.au
WWW: http://wwwrsphysse.anu.edu.au/nuclear/
Phone: +61-2-6125 2088
Fax: +61-2-6125 0748

Dept. of Nuclear Physics        
Research School of Physics and Engineering
Australian National University  
Canberra ACT 0200  AUSTRALIA