现有一个java脚本，通过串口发两ASCII字符到PLC，用串口监控看确定有发，但PLC收不到，用串口助手用同样的格式发就可以收到，请高人指点。
19230    08:56:01    java.exe    IOCTL_SERIAL_SET_LINE_CONTROL    Serial2    SUCCESS    StopBits: 1 Parity: EVEN WordLength: 7    
19231    08:56:01    java.exe    IOCTL_SERIAL_SET_CHAR    Serial2    SUCCESS    EOF:0 ERR:0 BRK:0 EVT:0 XON:11 XOFF:13    
19232    08:56:01    java.exe    IOCTL_SERIAL_SET_HANDFLOW    Serial2    SUCCESS    Shake:1 Replace:40 XonLimit:16 XoffLimit:1024    
19233    08:56:01    java.exe    IRP_MJ_WRITE    Serial2    SUCCESS    Length 2: VU    
19234    08:57:26    java.exe    IRP_MJ_WRITE    Serial2    SUCCESS    Length 2: VD    
19235    08:57:29    java.exe    IRP_MJ_WRITE    Serial2    SUCCESS    Length 2: PS    
上面是java发的


72    08:50:35    CommAssistant.e    IOCTL_SERIAL_GET_COMMSTATUS    Serial2    SUCCESS        
173    08:50:35    CommAssistant.e    IOCTL_SERIAL_GET_COMMSTATUS    Serial2    SUCCESS        
174    08:50:35    CommAssistant.e    IOCTL_SERIAL_GET_COMMSTATUS    Serial2    SUCCESS        
175    08:50:35    CommAssistant.e    IRP_MJ_WRITE    Serial2    SUCCESS    Length 2: VU    
176    08:50:35    CommAssistant.e    IOCTL_SERIAL_GET_COMMSTATUS    Serial2    SUCCESS        
177    08:50:35    CommAssistant.e    IOCTL_SERIAL_GET_COMMSTATUS    Serial2    SUCCESS        
这是串口调试助手发的
PLC的格式：MOV H82 D8120
                      RS D200 K4 D300 K4

多谢大大的回复，问题已解决，是校验设置错了