EPICS Controls Argonne National Laboratory

Experimental Physics and
Industrial Control System

1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024  Index 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
<== Date ==> <== Thread ==>

Subject: Re: Help beginner with ASYN device support, ai record conversion to EGU
From: Eric Norum <[email protected]>
To: "Gomella, Andrew (NIH/NHLBI) [F]" <[email protected]>
Cc: epics Techtalk <[email protected]>
Date: Mon, 13 May 2013 10:15:20 -0700
1) LINR should be SLOPE.
2) I recommend that you have a look at StreamDevice -- it's now what I'd recommend as the best place to start to support a message-based device.


On May 13, 2013, at 10:07 AM, "Gomella, Andrew (NIH/NHLBI) [F]" <[email protected]> wrote:

> Hi,
> 
> I have been following Eric Norum's "How To Do Serial" guide ( http://www.aps.anl.gov/epics/modules/soft/asyn/R4-21/HowToDoSerial/tutorial.pdf) to write an application to control a serial port controller table top x-ray source.
> 
> So far everything works near perfectly (Thanks to Eric for the guide, and the writers of ASYN/EPICS), my only issue is that I am having trouble getting the Analog Input and Output fields to work properly. I can easily read and write the raw values (0 to 4095 due to it being a 12 bit DAC inside the xray's controller) but when I change the .db record to try and use ASYN's built in functions to convert the value I run in to issues. I'm definitely missing something that is probably obvious for most techtalk readers.
> 
> Here is one of the commands in the app source file.
> 
> {&DSET_AI, GPIBREAD, IB_Q_LOW, "RD1", NULL, 0, 127, NULL, 0, 0, NULL, NULL, NULL},
> 
> The controller responds to RD1 with 0000\r  with 0000 being from 0000 to 4095. (I tried using the format function, i.e. with "%u\r" but this didn't seem to work, but with NULL it does.)
> 
> Here is the corresponding section of my db file.  (which is how I was hoping it would work at first) srxr is the name of my device.
> 
> record(ai, "$(P)$(R):uAStatus")
> {
>    field(DESC, "Read Xray uA Monitor")
>    field(SCAN, "1 second")
>    field(DTYP, "srxr")
>    field(LINR, "LINEAR")
>    field(ASLO, "0.244")
>    field(AOFF, "0")
>    field(EGUF, "900")
>    field(EGUL, "0")
>    field(EGU, "uA")
>    field(INP,  "#L$(L) A$(A) @11")
> }
> 
> I tried changing DTYP to asynInt32, and then changing INP to the @asyn format, but this did not seem to work.
> 
> I also tried to change several of the fields, such as LINR to SLOPE. So far I only get the field showing as 0 (when it should be reading
> an output, or as the raw value.
> 
> Here are relevant portions of st.cmd
> 
> ## Register all support components
> dbLoadDatabase "dbd/srxr.dbd"
> srxr_registerRecordDeviceDriver pdbbase
> 
> ## Load record instances
> dbLoadRecords("db/devsrxr.db","P=srxr,R=,L=0,A=0")
> 
> drvAsynSerialPortConfigure("L0","/dev/ttyS0",0,0,0)
> asynSetOption("L0", -1, "baud", "9600")
> asynSetOption("L0", -1, "bits", "8")
> asynSetOption("L0", -1, "parity", "none")
> asynSetOption("L0", -1, "stop", "1")
> asynSetOption("L0", -1, "clocal", "Y")
> asynSetOption("L0", -1, "crtscts", "N")
> 
> As is, this just reads out the raw values of uA, rather than it being converted to EGU.
> 
> Alternatively someone can point me to example source code that runs a serial device, but is more complex
> than the filter wheel in the "How To Do Serial" guide (uses more record types like ai etc).
> 
> I couldn't find any that helped me with this issue.
> 
> Thanks,
> Andrew
> 

-- 
Eric Norum
[email protected]






Replies:
RE: Help beginner with ASYN device support, ai record conversion to EGU Mark Rivers
References:
Help beginner with ASYN device support, ai record conversion to EGU Gomella, Andrew (NIH/NHLBI) [F]

Navigate by Date:
Prev: Re: msi exitStatus bug Andrew Johnson
Next: RE: Help beginner with ASYN device support, ai record conversion to EGU Mark Rivers
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
Navigate by Thread:
Prev: Help beginner with ASYN device support, ai record conversion to EGU Gomella, Andrew (NIH/NHLBI) [F]
Next: RE: Help beginner with ASYN device support, ai record conversion to EGU Mark Rivers
Index: 1994  1995  1996  1997  1998  1999  2000  2001  2002  2003  2004  2005  2006  2007  2008  2009  2010  2011  2012  <20132014  2015  2016  2017  2018  2019  2020  2021  2022  2023  2024 
ANJ, 20 Apr 2015 Valid HTML 4.01! · Home · News · About · Base · Modules · Extensions · Distributions · Download ·
· Search · EPICS V4 · IRMIS · Talk · Bugs · Documents · Links · Licensing ·