multidrop control network - Electronic Circuits Projects Diagrams Free

leedude · 8th October 2008, 05:31 AM

hi, i am building a set of small computer-actuated lights for placing around my front garden.
i need a way of linking them all up along a uni-directional bus to my computer, which will send positional info to them at 19200baud through it's UART.

I am concerned about interference affecting the signal.
is it possible to just connect the serial-port's TX pin and ground to some twisted pair cable, and take connections off of it for each lighting unit?
or would i need to use a protocol such as RS485 with termination resistors and the like to avoid signal smooshing?

could i also run a power supply down this cable without damaging the signal?

there will be about 5 light units.

Lee.

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8th October 2008, 05:31 AM	(permalink)
leedude	multidrop control network hi, i am building a set of small computer-actuated lights for placing around my front garden. i need a way of linking them all up along a uni-directional bus to my computer, which will send positional info to them at 19200baud through it's UART. I am concerned about interference affecting the signal. is it possible to just connect the serial-port's TX pin and ground to some twisted pair cable, and take connections off of it for each lighting unit? or would i need to use a protocol such as RS485 with termination resistors and the like to avoid signal smooshing? could i also run a power supply down this cable without damaging the signal? there will be about 5 light units. Lee.