I'm helping a co-worker design an improved RS232 breakout box (for in-house 
use), which will have an LED for each of the lines (except ground). Each LED 
has three states: Green (active), Red (inactive), and Off (no signal).

What is the most straightforward way to implement this?

We have a solution using a MAX248 (which is also used to convert to TTL), 
and an inverter to drive LEDs, which takes care of the Green/Red 
functionality. However, we're having some difficulty with finding a simple 
and elegant solution that would turn the LED off.

Thank you in advance,

Vitaliy 

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