communications protocol for the Arduino

Development Boards Arduino
1

I am looking for a communications protocol for the Arduino .

I was considering the RS232 But I read 3 wire unshielded RS232 has a limit of about 50 feet.

For my application I can greatly reduce my baud rate from RS232. But I would like my cable to go as far as 250 feet.

Thank you

Steven

2

What is the Arduino “talking” to ? An Arduino would need an RS232 IC to talk RS232. What baud rate do you need ? RS232 isn’t really limited to 50’, it’s a matter of the cable’s capacitance and the baud rate. But since you’d have to add some circuitry to do RS232, why not go RS422 over Cat5 cable ?

https://www.sparkfun.com/products/11959

(read the comments !)

[RS485 is RS422, but allowing for multiple taps]

3

steven834:
I am looking for a communications protocol for the Arduino .

I was considering the RS232 But I read 3 wire unshielded RS232 has a limit of about 50 feet.

For my application I can greatly reduce my baud rate from RS232. But I would like my cable to go as far as 250 feet.

Thank you

Steven

RS232 will go 250 ft. with the proper low capacitance cable (CAT5e can be used) and keeping the baud rate to about 19.2K or other by experiment.

Also, some RS232 line drivers are better than others.

RS485 drivers are normally use for long runs.