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Subject: Help beginner with ASYN device support, ai record conversion to EGU
From: "Gomella, Andrew (NIH/NHLBI) [F]" <[email protected]>
To: "[email protected]" <[email protected]>
Date: Mon, 13 May 2013 17:07:48 +0000
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


Replies:
Re: Help beginner with ASYN device support, ai record conversion to EGU Eric Norum

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