Controlling Nanotec N5 motor controller using matlab webread and webwrite commands

I am using Nanotec N5 motor controller that is shipped with a built in web interface called NanoIP.

Using this interface I can query data from the controller object dictionary using webread. For example

>> webread('http://169.254.58.57/od/6060/00')

ans =

02

Now I would like to write values as well, however, each time I try I fail and get an error messages. For example if I input the data as characters:

>> webwrite('http://169.254.58.57/od/6060/00','01')

I get this error:

Error using readContentFromWebService (line 45)

The server returned the status 400 with message "BAD REQUEST" in response to the request to URL http://169.254.58.57/od/6060/00.

Error in webwrite (line 132)

[varargout{1:nargout}] = readContentFromWebService(connection, options);

and if I input data as numbers:

>> webwrite('http://169.254.58.57/od/6060/00',1)

I get this error:

Error using webwrite (line 126)

The media type 'application/x-www-form-urlencoded' is not permissible for numeric or logical data.

Am I doing something wrong here? Should I use different data type?

Answer 1

[Mohammad Moataz]

Ok, It turned out that I should have added extra double qoutes when passing a value to Nanotec controller using webwrite command. example:

>> webwrite('http://169.254.58.57/od/6060/00','"01"')

Now it works.

[Chris]

Hello,

firstly thanks for your information’s! They are really helpful for me! I use the Nanotec controller N5-2-3 and the function "webread" works fine but for "webwrite" I always get an error "Time out after 5 seconds". I try a lot of things e.g. change the header but the problem still existed. May you have an idea?

Thanks a lost!

[Mohammad Moataz]

I didn't face such error, but I believe it might be something with connections or its configuration (not with Matlab). In my case I was connecting to the controller using ethernet cable which works as both input and output. I don't remember the configurations now as this was 2 years ago. You can also try to manually write values from your web browser to make sure it is possible. I hope you can figure it out.