S meter information of TS-680 (in Japan), TS140, TS-140 (other contries)

 Now, I'm preparing the report that I already tried to get  S meter information  of TS-680 (in Japan), TS140, TS-140 (other contries) about 1.5 years ago. This system is consist of the A/D converter and another serial interface. It was difficult because of very low current of S-meter. The insulated and differetiol DC-Amprifier was needed.