【求助】instrcallback触发问题

[xukeuniversal]

我现在波特率用115200，8000字节触发一次event。就是g.ByteAvailableFcnCont=8000，也就是说1000个数据画一次图。

但我算了一下，我现在一秒钟可以传出来将近4000个数，但为什么matlab主空间里显示的是每两秒触发一次instrcallback函数？而应该是一秒钟至少触发三次阿。

.M文件部分设置：
scom.OutputBufferSize=10000;
scom.InputBufferSize=10000;
scom.BaudRate= 115200;
scom.ReadAsyncMode='continuous'
scom.BytesAvailableFcnMode='byte';
scom.BytesAvailableFcnCount=8000;
scom.BytesAvailableFcn=@instrcallback;

主space部分显示：
BytesAvailable event occurred at 11:49:50 for the object: Serial-COM1.
BytesAvailable event occurred at 11:49:52 for the object: Serial-COM1.
BytesAvailable event occurred at 11:49:54 for the object: Serial-COM1.
BytesAvailable event occurred at 11:49:56 for the object: Serial-COM1.
BytesAvailable event occurred at 11:49:58 for the object: Serial-COM1.
BytesAvailable event occurred at 11:50:00 for the object: Serial-COM1.
BytesAvailable event occurred at 11:50:02 for the object: Serial-COM1.
BytesAvailable event occurred at 11:50:04 for the object: Serial-COM1.
BytesAvailable event occurred at 11:50:06 for the object: Serial-COM1.
BytesAvailable event occurred at 11:50:08 for the object: Serial-COM1.


还请高手指点。感谢！