next topic »

[on:]

 
If I was using one of these motor controllers which can accept all sorts of protocols for sending commands, what would be the best way send commands down a cat5 cable to it from a long distance like 100ft? It's not a wiring question but a question of which command protocol will still be interpretable by the controller 100ft down a wire. Or, which protocol could most easily be made to work that far.
http://www.pololu.com/catalog/category/96

[Reply #1 on:]

For that distance I would use asynchronous serial RS-232.

[Reply #2 on:]

should I just use an arduino serial out to do that? Anything special needed for this scenario?

[Reply #3 on:]

should I just use an arduino serial out to do that? Anything special needed for this scenario?

You'd need an RS232 driver at each end.

[Reply #4 on:]

why can't the arduino do it by itself?

[Reply #5 on:]

why can't the arduino do it by itself?

Because RS232 has voltages that are +12V and -12V, the arduino can only output 0V and +5V. It is the TTL option.

[Reply #6 on:]

In the picture I see TTL on the board. For only 100' a servo control signal might work.

[Reply #7 on:]

In the picture I see TTL on the board. For only 100' a servo control signal might work.

Yes especially if the TTL was driving an open collector transistor with a pull up to 12V or so. But he did ask what I would use and that is RS232.

[Reply #8 on:]

In the picture I see TTL on the board. For only 100' a servo control signal might work.

Yes especially if the TTL was driving an open collector transistor with a pull up to 12V or so. But he did ask what I would use and that is RS232.

Sometimes it saves time and effort to provide options that the person may not be aware of.

[Reply #9 on:]

Sometimes it saves time and effort to provide options that the person may not be aware of.

If I am asked what I would do then why should I reply with something I would not do. You have to admit that sending TTL down a 100' line is not a sure fire hit is it?

[Reply #10 on:]

You could use a current loop.
OR
Does anyone know if I2C would work?

[Reply #11 on:]

Does anyone know if I2C would work?

Yes ..... No

[Reply #12 on:]

Sometimes it saves time and effort to provide options that the person may not be aware of.

If I am asked what I would do then why should I reply with something I would not do. You have to admit that sending TTL down a 100' line is not a sure fire hit is it?

Not a sure fire miss ether. You do what you, better or worse. 

[Reply #13 on:]

what if you buy a shielded network cable, you might get away with 5v logic