A.SBUS-S1 B.SBUS-S2 C.SCnetⅡ D.TCP/IP
A.<=100m B.100m<=節(jié)點(diǎn)間距離<=185m C.185m<=節(jié)點(diǎn)間距離=500m D.>=500m
A.1km B.10km C.100km D.1000km