出現了下面這段英文
不懂為什麼會這樣
Error using serial/fopen (line 72)
Open failed: Cannot connect to the COM5 port. Possible reasons are another
application is connected to the port or the port does not exist.
我檢查了連線
rs232drv
Serial Port Object : Serial-COM5
Communication Settings
Port: COM5
BaudRate: 19200
Terminator: 'LF'
Communication State
Status: closed
RecordStatus: off