I am using dio functions on windows to read RS232 port.
I can read/write but it seems that the write function cannot be binary.
dio_write($com1,chr(10),1); will result in writing 2 bytes 0D 0A be cause \n is translated to \r\n. I have not found any way to overcome this limitation so far
(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)
dio_read — Reads bytes from a file descriptor
$len= 1024 ] )
The function dio_read() reads and returns
len bytes from file with descriptor
The file descriptor returned by dio_open().
The number of bytes to read. If not specified, dio_read() reads 1K sized block.
The bytes read from
- dio_write() - Writes data to fd with optional truncation at length