We've gone that route (streamDevice) for the relatively pedestrian
requirements for the Galil motor controllers we use. No coordinated
motion, or programmed movements; just discrete single axis motion with
switches at each limit. The polling generates a lot of traffic, so we
put the controllers on dedicated LANs. We did attempt to provide
functionality that is similar to the motor record functions that we
previously used in older applications with OMS VME motor controllers, by
using logic in EPICS base records.
So far, we've only encountered a few hiccups and were able to address
On 02/07/2017 09:04 AM, Kevin Peterson wrote:
In general, the recommendation to write a model 3 driver is a good one.
Under some circumstances, however, that is far from the easiest option.
If the controller doesn't have a status command that allows queries of
the moving state, it can be awkward and inefficient to make the model 3
driver work well with the motor record, which expects the driver to
reliably set the done bit of the MSTA field.
If the goal is EPICS support and the motor record is not required, I
have found that StreamDevice support
(http://epics.web.psi.ch/software/streamdevice/) is a much better fit
and significantly easier to write.
On 2/7/17 3:53 AM, Ralph Lange wrote:
Dear motion specialists,
I am writing on behalf of Paramveer Jain (in CC) who has contacted me
with this issue, but as I have never done motion control integration
with EPICS, I'd rather throw this ball up than send him into the wrong
He is being tasked with developing EPICS support for a locally developed
The hardware setup can be summarized as:
* Moxa embedded TCP-to-serial converter (NE4110S)
* Serial connection (RS-232)
* Homemade motor controller (based on an AT89C52)
* Ark Motion AMS 3630 stepper motor driver.
The controller software talks ASCII in command/response fashion, e.g.:
* Read position (rotary encoder)
Command: STX U<CR>
Response: STX U pppppp<CR>
pppppp = six digit hex (divide by 640 to get millimeter)
* Go to position (rotary encoder)
Command: STX P1 sss pppppp<CR>
Response: \06 (ACK)
sss = three digit hex (speed in mm/s multiplied by 240)
pppppp = six digit hex (millimeter multiplied by 640)
What's the best/easiest way to do this? What are the caveats?
Is there a tutorial he could follow?
Is there existing support for another motor that he could start from?
Thanks a lot for your help!
- Re: How to support a new stepper motor controller? Paramveer Jain
- How to support a new stepper motor controller? Ralph Lange
- Re: How to support a new stepper motor controller? Kevin Peterson
- Navigate by Date:
RE: How to support a new stepper motor controller? Mark Rivers
FEMTO amplifier DLPCA-200 Ibrahim Saleh
- Navigate by Thread:
Re: How to support a new stepper motor controller? Kevin Peterson
Re: How to support a new stepper motor controller? Paramveer Jain