The resolution isn’t the most important question, however if it is possible I would like to experiment the higher resolution possible (weighting the price also). Usually, the higher the resolution the higher the cost.
Other question is what I make with AD7705. Can I direct connect the output digital signal to serial port of my PC? No, thats not possible
If I understood with only the AD7705 I can read the analog signal of the strain gauge in serial port of PC with 16 bit of resolution. Correct? Yes that is correct