一个问题请教各位：PC上串口调试软件和PLC进行自由口通讯，以下截取的一段通讯报文：开始符是10，结束符是FF，为什么有时候一包数据会分两包发送呢，（感觉中间有歇息了一下），就是以下不整齐的地方：

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00

00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00

00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00

00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00

FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C E0 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF 10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00

00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00

00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00 00 00 00 FF

10 00 0C 00 00 00 00 00 00 00 00 00

00 00 00 FF