My main goal is to be able to send a PWM signal to an IRFZ44N (MOSFET) over Max 485 to dim a 12v led with its own power source from a distance of 10 feet.
is this possible?
Thank you
Please do a Google search for RS-485, It will show you the type of signal for RS-485 and it is NOT suitable for what you are attempting.
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If you have a pair of MAX485 devices, one in permanent TX (the end generating the PWM signal) and the other in permanent RX (the LED end), then I can't see an issue. As far as I can tell, you're just using a pair of differential line driver/receivers to transfer a 1 or a 0 over a distance.
You may need additional circuitry to drive the MOSFET from the output MAX485 RO pin.
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The MAX485 does not care about the nature of the signal, only the logic level is of interest. @markd833 explains the usage of line drivers for digital signal transmission in #3.
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I missed that he was using an adapter at each end of the wires.
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