Re: StreamDevice/ASYN connection to a Telnet port

[Daron Chabot <daron.chabot@gmail.com>]

FWIW, I also see similar one-char-at-a-time behavior from a Pfeiffer Maxigauge TPG-256-A. This is using the serial interface on the gauge-controller through a moxa 5650 terminal server.

We are using 3.14.11 with the asyn and streamdevice version as distributed in synapps 5.5.

On Wed, Feb 2, 2011 at 11:06 AM, Eric Norum <eric@norum.ca> wrote:

I think that this is the result of the device (stupidly and inefficiently) sending one character per IP packet.

On Feb 2, 2011, at 7:30 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
>

--
Eric Norum
eric@norum.ca