Experimental Physics and
Industrial Control System

William Kirstaedter (PP&B)
Fritz-Haber-Institut der MPG
Faradayweg 4-6
14195 Berlin
Tel: 030 8413 5405
Mail: [email protected]

-------- Weitergeleitete Nachricht --------

Betreff:	Re: streamdevice I/O Intr
Datum:	Fri, 30 Nov 2018 09:57:33 +0100
Von:	William Kirstaedter <[email protected]>
An:	Christoph Schroeder <[email protected]>

Hi Christoph,

thats exactly what Heinz Junkes suggested me a moment ago. :D

I'll try that then...

William Kirstaedter (PP&B)
Fritz-Haber-Institut der MPG
Faradayweg 4-6
14195 Berlin
Tel: 030 8413 5405
Mail: [email protected]

Am 30.11.2018 um 09:46 schrieb Christoph Schroeder:

Hi William,

I remeber, that I had a similar problem with a device which send data
with a 50Hz rate (20ms). I tried setting PRIO of the output record to
high too and it didn't help. I played around with the StreamDevice
variables and somehow got around it by setting ReadTimeOut and
PollPeriod to half of the input rate:
rdInputCont{
    ReadTimeout = 10;
    PollPeriod = 10;
    in "%#s";
}

I didn't had the time to go into detail of the problem and therefore I
don't really understand why that helped. The device seemed worked fine
without any error messages and I somehow forgot about that later since
this was only a temporary setup. Can you try it and tell me if it
helped? Maybe this will help to find the real cause of the problem.

Best regards,
Christoph


On 11/29/18 11:34 AM, William Kirstaedter via Tech-talk wrote:

Hi,

I have a small problem with a fast Device, maybe somebody already had
this problem and can help out? :)

It runs via I/O Intr.
I am able to start the reporting, but I cant stop it. It seems that
the stop command doesnt get through....
could it be that somehow the communication is blocked by the fast
input? how could I fix that?

Its really simple to control:
You send "STM\r", it starts reporting every 18ms "tmp,<float>,<float>\r"
You send "ETM\r", it stops doing that, terminating communication with
"txx\r".

all ASCII formatted.

my records:

tc.db file:

record(bo, "$(P):$(R):Toggle"){
   field(DESC, "Toggle Reading")
   field(DTYP, "stream")
   field(OUT, "@tc.proto toggle $(BUS)")
   field(ZNAM, "ETM")
   field(ONAM, "STM")
   field(VAL, "0")
}

record(ai, "$(P):$(R):Temperature") {
  field(DESC, "Temperature")
  field (DTYP, "stream")
  field (INP, "@tc.proto read_K $(BUS)")
  field (SCAN, "I/O Intr")
  field(EGU, "K")
}

record(ai, "$(P):$(R):ThermoVoltage"){
  field(DESC, "TC Thermovoltage")
  field(DTYP, "stream")
  field(INP, "@tc.proto read_nV $(BUS)")
  field(SCAN, "I/O Intr")
  field(EGU, "nV")
}

tc.proto file:

Terminator = CR;
ExtraInput = Ignore;


toggle {
        out "%{ETM|STM}";
        in "txx";
};

read_K {
        in "tmp,%f,%*f";
};

read_nV {
        in "tmp,%*f,%f";
};

-- (bb|[^b]{2})


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