A.28.5V,23.4V,22.2V B.28.2V,23.4V,22.2V C.28.5V,27V,22.2V D.28.2V,26.76V,23.4V
A.10 B.15 C.20 D.25
A.TTY B.VT52 C.VT100 D.自動檢測