Format of Access Server statistics:
Offset	Size	Description	)
 00h	BYTE	port number
 01h	BYTE	external status signals (see #02922)
 02h	BYTE	transmitter status (see #02920)
 03h	BYTE	receiver status (see #02921)
 04h	DWORD	number of characters received
 08h	DWORD	number of characters transmitted
 0Ch	WORD	input parity errors
 0Eh	WORD	input framing errors
 10h	WORD	lost characters due to hardware overrun
 12h	WORD	lost characters due to data buffer overrun
Note:	the counts are not allowed to wrap around; once a count reaches FFFFh
	  or FFFFFFFFh, it is no longer incremented