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<== Date ==> <== Thread ==>

Subject: Re: StreamDevice/ASYN connection to a Telnet port
From: John Dobbins <[email protected]>
To: Maren Purves <[email protected]>
Cc: EPICS Tech-Talk <[email protected]>
Date: Mon, 07 Feb 2011 19:37:53 -0500
Maren,

The Gamma/Digitel SPCe has two interfaces, ethernet and RS-232. The problems I reported were with the ethernet interface which I have abandoned in favor of the RS-232 for now.

Thanks,

John


On 2/7/2011 4:39 PM, Maren Purves wrote:
Hi Dirk,

I have mine solved, I was just wondering whether John
may need a similar solution (namely to delete the first
N<cr>  and<lf>s - I strip out a lot more than that but
that's because the output is longer than what channel
access will accept).

Thanks,
Maren

Dirk Zimoch wrote:
Hello Maren,

StreamDevice can parse the 3 lines and put the interesting bits of
information into other records. It is not so easy to re-format it to one
long line.

Please give an example of your input an what you want to do with it.

Dirk


Maren Purves wrote:
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








References:
StreamDevice/ASYN connection to a Telnet port John Dobbins
Re: StreamDevice/ASYN connection to a Telnet port Dirk Zimoch
Re: StreamDevice/ASYN connection to a Telnet port John Dobbins
Re: StreamDevice/ASYN connection to a Telnet port Maren Purves
Re: StreamDevice/ASYN connection to a Telnet port Dirk Zimoch
Re: StreamDevice/ASYN connection to a Telnet port Maren Purves

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