Re: StreamDevice/ASYN connection to a Telnet port

[Maren Purves <m.purves@jach.hawaii.edu>]

John/Dirk,

does StreamDevice/ASYN have or allow a custom read function
like drvAscii does? I have one for our dust monitor that turns
3 lines of reply (which are spaced out in time) and way too
long for drvAscii into something that is one line of less than
80 characters.

Wondering,
Maren

John Dobbins wrote:
> 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