A.2路RS485接口和1路RS422/RS485接口 B.1路RS485接口及1路RS422/RS485接口 C.1路CAN總線接口和1路RS422/RS485接口 D.1路CAN總線接口和2路RS422/RS485接口
A.24V B.15V C.10V D.5V
A.MC68332 B.27C040 C.DS1250 D.DS1386