Experimental Physics and
Industrial Control System

John Dobbins <[email protected]> · Wed, 02 Feb 2011 11:08:07 -0500

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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System