[Tutor] Python serial interface

[Colin Ross]

I am using the following controller:

http://www.aerotech.com/product-catalog/drives-and-drive-racks/ensemble-mp.aspx

Which does not specifically list python as one of the accepted languages,
but I guess this does not mean it is not possible.

Colin

On Wed, Apr 1, 2015 at 12:58 PM, Colin Ross <colin.ross.dal at gmail.com>
wrote:

> Thank you Francois, this gives me a lot to think about!
>
> I really appreciate your feedback.
>
> Colin
>
> On Wed, Apr 1, 2015 at 12:50 PM, Francois Dion <francois.dion at gmail.com>
> wrote:
>
>> On Wed, Apr 1, 2015 at 11:01 AM, Colin Ross <colin.ross.dal at gmail.com>
>> wrote:
>>
>>> Hi Francois,
>>>
>>> Thank you for the fast reply! I am looking to control a brushless servo
>>> motor (
>>> http://www.aerotech.com/product-catalog/motors/rotary-motors/bms-series.aspx)
>>> that drives a rotary stage.
>>>
>>
>> These motors are not controlled by serial, you'll need a brushless
>> controller. In turn the controller might be or not serial, or ip or
>> something else altogether (PWM is typical). They do have an rs-422
>> connection, but that is for a feedback signal. So you are building a
>> feedback control system. If you google that and python you'll find several
>> useful references, including a design and analysis module (but not control):
>>
>> https://pypi.python.org/pypi/control/0.6.6
>> http://sourceforge.net/projects/python-control/
>>
>> Nothing out of the box for your application, obviously. Also, the motor
>> control itself will depend on the microprocessor hardware you are using and
>> the motor controller. Assuming PWM, the raspberry pi has a software PWM
>> module in Python. Same with micropython. Anything else is pretty much DIY.
>>
>> As for the overall concept of control systems, Chapter 9 of "Real World
>> Instrumentation" ( http://shop.oreilly.com/product/9780596809577.do )
>> will give you an overview of what is involved (with some python example,
>> but not directly applicable to your system).
>>
>> Francois
>> --
>> raspberry-python.blogspot.com - www.pyptug.org - www.3DFutureTech.info
>> <http://www.3dfuturetech.info/> - @f_dion
>>
>
>