Re: EPICS modulle for Piezosystem Jena's piezo controller NV 40/1 CLE

[LiangChih Chiang via Tech-talk <tech-talk at aps.anl.gov>]

Hello, EPICS mates,

just some status updates.

I use the streamDevice support for Jena NV40/1 CLE in the ip module github.com/epics-modules/ip

and add a soft motor on it (Thanks Matthew Pearson).

The connections between the fields of soft motor and records created by streamdevice:

OUT -> write (write desired position value to controller).

RDBL -> read (read the current position value from controller continuously)

STOO -> a dummy record (because there is no STOP command)

DINP -> a faked record to simulate DMOV value from 1 to 0 to 1. (because there is no such information from controller)

Basically, it works.

Just one little details: (I knew this long time ago, discovered it again.)

If MRES is set to 1, any movement less than 1 will not cause the RBV field of motor record to update.

I think the reason is that "RMP" field of motor record is of type long integer, not float.

On Fri, May 22, 2026 at 7:45 AM LiangChih Chiang <yehnan174 at gmail.com> wrote:

>There is streamDevice support for the Jena NV40 and NV40/3 CLE in the ip module:

Thanks a lot.

Then I can build a soft motor on it.

On Fri, May 22, 2026 at 5:43 AM Peterson, Kevin M. <kmpeters at anl.gov> wrote:

There is streamDevice support for the Jena NV40 and NV40/3 CLE in the ip module:

github.com/epics-modules/ip

Kevin

________________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Abdalla Ahmad via Tech-talk <tech-talk at aps.anl.gov>
Sent: Monday, May 18, 2026 5:00 AM
To: LiangChih Chiang
Cc: tech-talk at aps.anl.gov
Subject: Re: EPICS modulle for Piezosystem Jena's piezo controller NV 40/1 CLE

I am not saying it is not possible; it just does not make sense, not to mention the effort you will spend in developing a motor driver instead of relying on something simple like a stream device. A model 3 motor driver consists of two C++ classes inherting from asynMotorController and asynMotorAxis classes which are part of the motor support module. You will need to implement some methods like polling the controller, setting/reading the position, etc. Next, you will create your dbd files and call your driver into the st.cmd of your IOC, not to mention the motor record GUI. The motor support module contains a lot of motion controllers support module.

You can choose this or just create a stream device IOC with 6 PVs like you requested.

Best Regards,
Abdalla.

________________________________
From: LiangChih Chiang <yehnan174 at gmail.com>
Sent: Monday, May 18, 2026 12:00 PM
To: Abdalla Ahmad <Abdalla.Ahmad at sesame.org.jo>
Cc: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: EPICS modulle for Piezosystem Jena's piezo controller NV 40/1 CLE

Hi,

> I don't think developing a model 3 motor driver for this piezo controller makes sense.
I agree.

But I would like to provide motor record for this piezo controller,
in order to treat it like a motor.

>Model 3 motor driver requires other parameters such as velocity, motor resolution, homing, jogging, etc.
Can't I just provide dummy values for these parameters?


On Mon, May 18, 2026 at 4:49 PM Abdalla Ahmad <Abdalla.Ahmad at sesame.org.jo<mailto:Abdalla.Ahmad at sesame.org.jo>> wrote:
Hi

I don't think developing a model 3 motor driver for this piezo controller makes sense. Model 3 motor driver requires other parameters such as velocity, motor resolution, homing, jogging, etc. A stream device interface works the best for your case.

Best Regards,
Abdalla.

________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov<mailto:tech-talk-bounces at aps.anl.gov>> on behalf of LiangChih Chiang via Tech-talk <tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>>
Sent: Monday, May 18, 2026 10:40 AM
To: tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov> <tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>>
Subject: EPICS modulle for Piezosystem Jena's piezo controller NV 40/1 CLE

Dear EPICS mates,

I need to control a piezo actuator via
Piezosystem Jena's piezo controller NV 40/1 CLE,
which is very old and discontinued.

Its commands are extremely simple:(please see attach files)
i1  activate remote control
i0  deactivate remote control
cl  closed loop on
ol  closed loop off
rd  read a value (µm for closed loop, volt for open loop)
wr,<value>  write a value  (µm for closed loop, volt for open loop)

I'm wondering if it's possible to develop
a "Model 3" motor driver for it.

Do you guys have experience for similiar suuch simple devices?