In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

I forgot about the lower voltage Max3232.  RS-232 is good for about 50 feet.  One could use an RF link for distance, but more power overhead.

This seems like an excellent combo for a remote network with the RS-485 allowing 1000m of wire and multiple modules, but it seems that I would have to get a bit more complicated unless I can locate a lower voltage RS-485 driver or settle for a higher minimum voltage to issue the message without shutting down the unit.  

Brown-out can shut down the unit, but it doesn't save anything, does it?  So, if there is data to be saved, you need to send it over the serial connection before the brown-out occurs.

I suppose that I could have a 'Back-up' battery.  The low voltage would then switch supplies and issue a message to call for immediate battery maintence while buying time.  

Anyone in rural America that has to go to a roadside mail box would be interested in an RS-485 system such as this.

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