·WS1521,WS1521A,WS1521B,WS1521C
·WS1522,WS1522A,WS1522B,WS1522C
·WS1523 WS1524,模入模出隔离端子
·WS1525,WS1525A,WS1525B,WS1525C
·WS15242,WS15242A,WS15242B,WS15
·WS15252,WS15252A,WS15252B,WS15
·WS15244,WS15244A,WS15244B,WS15
·WS21522,WS21522A,WS21522B,WS21
·WS21525,WS21525A,WS21525B,WS21