Description
EXT为请求标志,ASCII值3,VB中以chr(3)表示;
表格中红色字为需要求和效验的部分;
和效验为每一项的ASCII值的总和转换成十六进制后区低两位;
站号、PLC号、元件数量、和效验都是以十六进制表示;
等待延时为0-150毫秒,以十六进制0H-FH表示,如100ms为AH。
批量读出位元件–BR指令
PC侧:ENQ站号PLC号BR延时首地址数量和效验ACK站号PLC号
PLC侧:STX站号PLC号数据EXT和效验
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