GE IC670CHS001E I/O基础模块
PQM允许单独存储日期和时间。换句话说，可以发送广播命令来存储日期或时间。错误响应当PQM检测到CRC错误以外的错误时，将向主机发送响应。FUNCTION CODE（功能代码）字节的MSbit将设置为1（即，从从机发送的功能代码将等于从主机发送的功能码加上128）。以下字节将是一个异常代码，指示发生的错误类型。PQM将忽略从具有CRC错误的主机接收的传输。从机对错误（CRC错误除外）的响应为：•从机地址：1字节•功能代码：1字节（MSbit设置为1）•异常代码：1个字节•CRC：2字节PQM执行以下异常响应代码。01-非法功能传输的功能代码不是PQM支持的功能之一
The PQM allows the date and time to be stored separately. In other word, a broadcast command can be sent to store just date or time.Error Responses When a PQM detects an error other than a CRC error, a response will be sent to the master. The MSbit of the FUNCTION CODE byte will be set to 1 (i.e. the function code sent from the slave will be equal to the function code sent from the master plus 128). The following byte will be an exception code indicating the type of error that occurred. Transmissions received from the master with CRC errors will be ignored by the PQM. The slave response to an error (other than CRC error) will be: • SLAVE ADDRESS: 1 byte • FUNCTION CODE: 1 byte (with MSbit set to 1) • EXCEPTION CODE: 1 byte • CRC: 2 bytes The PQM implements the following exception response codes. 01 - ILLEGAL FUNCTION The function code transmitted is not one of the functions supported by the PQM
