Re: StreamDevice/ASYN connection to a Telnet port

[John Dobbins <john.dobbins@cornell.edu>]

Dirk,

As it turns out this device really is sending one character per network 
packet. The device is a new version of the Gamma/Digitel Small Pump 
Controller which has an optional ethernet interface. The ethernet 
interface has other problems, e.g. one can crash the controller (turning 
of the pump H.V.) by overloading it with data requests. Gamma tells me 
they are working on improving the ethernet interface. For now I as using 
the RS-232 interface for this device which operates without problem.
Thanks,

John Dobbins




On 2/2/2011 10:30 AM, Dirk Zimoch wrote:
> Hi John,
>
> StreamDevice normally reads first a single byte and then the rest in
> chunks of up to 63 bytes. The reason is that the first byte uses a
> different timeout (ReplyTimeout) than the others (ReadTimeout). The rest
> is fetched in 63 bytes chunks because I use an internal buffer of 64
> bytes and want to be able to add a null byte at the end to avoid
> problems with some debug output.
>
> So the first "read 1" is normal. What surprises me are the other lines.
>
> When you switch on debugging in StreamDevice (var streamDebug 1), what
> do you see?
>
> Dirk
>
> John Dobbins wrote:
> > 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