RE: NDArrayData Access

[Mark Rivers <rivers@cars.uchicago.edu>]

Have you Enabled the NDPluginStdArrays plugin?

Please send a screen shot of the NDPluginStdArrays plugin medm or edm screen.

Is the simulationr detector running and producing non-zero data? 

Please open and enable the NDPluginStats (Stats5:) plugin and look at the minimum, maximum and mean values of the data.

Also send the output of epicsPrtEnvParams at the IOC and printenv | grep EPICS at the client console.

Mark

________________________________________
From: Yingbing Yan [yanyingbing@sinap.ac.cn]
Sent: Monday, May 28, 2012 9:30 AM
To: Mark Rivers
Cc: tech-talk@aps.anl.gov
Subject: RE: NDArrayData Access

Hi Mark,

> What application produced that output?  Was it caget?
Yes, the output of caget. such as
caget XX:image1:ArrayData
XX:image1:ArrayData 921600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 ...

> I suspect your problem is that you have not set the environment
variable EPICS_CA_MAX_ARRAY_BYTES correctly.
I have set this environment variable.

Yingbing


On Mon, 2012-05-28 at 14:20 +0000, Mark Rivers wrote:
> Hi Yingbing,
>
> You showed the following output:
>
> 1 0 0 0 0 0 ...
> 2 0 0 0 0 0 ...
>
> What application produced that output?  Was it caget?
>
> I suspect your problem is that you have not set the environment variable EPICS_CA_MAX_ARRAY_BYTES correctly.  You should set that to a value a little larger than the maximum array size you will use (in bytes).  It must be set in both the IOC application and on the channel access client.
>
> To check if it is set correctly on the IOC you can use the following command at the IOC shell:
>
> IepicsPrtEnvParams
>
> To see if it is set correctly on the client end you can just use the following command at the Linux shell:
>
> printenv | grep EPICS
>
>
> Mark
>
> ________________________________________
> From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Yingbing Yan [yanyingbing@sinap.ac.cn]
> Sent: Monday, May 28, 2012 8:58 AM
> To: tech-talk@aps.anl.gov
> Subject: NDArrayData Access
>
> Dear all,
>
> I want to implement a application via a costumed class, which inherits
> directly from the asynNDArrayDriver. It is similar with simDetector in
> the areaDetector, just skips the ADDriver.There is no error during
> compiling and running. The parameters (asynOctet, asynInt32,
> asynFloat64) can also be read & write using caget & caput. But I can not
> get the correct array data of NDArray object using NDStdArrays plugin,
> the output are just
> 1 0 0 0 0 0 ...
> 2 0 0 0 0 0 ...
> No matter how I modify the parameters or the source codes.
>
> Finally, I try to use simDetector directly(the defalut ioc startup
> script), but the problem is similar, even using the prebuilt
> areaDetector.
> How to access the NDArrayData through NDStdArrays plugin? Are other
> configurations required?
>
>
> Best regards
> Yingbing
>
>