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In lugnet.robotics.nxt, Juergen Stuber wrote:
> Hi Christian,
>
> "Christian Mock" <chrimo-@-moccy.xdsnet.de> writes:
> >
> > My problem is the bitrate of 921,6 kbits/s.
> > Simple cheap MCU like ATMega didn't support this bitrate (as far as I know).
>
> the RS-485 interface is directly connected to the AT91SAM7S USART,
> so you can choose the bit rate quite freely.
>
> > To add an external devices (e.g MCU+SD-Card or MCU+serial camera ) to NXT,
> > it seems to be neccessary to implement the P-Net-Protocol
> > (http://www.p-net.org).
> > Is this protocol allways used when using Port4 highspeed communication ?
>
> No, it is not necessary, P-Net is just a field bus which seems to be
> popular in Denmark, there are others which can be used with RS-485.
>
> Any of these protocols based on RS-485 should be possible with the NXT.
>
>
> Jürgen
Hi Juergen,
Yes, I found this night the entries at Lego-Source-Code...
and no line about P-NET-Protocol...
My first thought was to implement a simple p-net-node at own MCU, but now I can
try my own communication from NXT (master) to external MCU+SD-Card (slave) :D
Thanks for your information
Bye
Christian
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