Parallel Device Interfaces, Internal Names, and Symbolic Links

This section describes the device interfaces, internal names, and symbolic links that are created by the system-supplied parallel drivers for parallel ports and devices attached to parallel ports.

For each parallel port enumerated in the system and for each parallel device enumerated on a parallel port, the parallel drivers create device objects, interfaces, internal names, and unprotected symbolic links as follows.

Device type	Device object	Device interface	Internal name	Symbolic link
Parallel port	FDO	GUID_PARALLEL_DEVICE	"\Device\ParallelPortm", m >= 0	None
Raw parallel device	PDO	GUID_PARCLASS_DEVICE	"\Device\Parallelm", m >= 0	"LPTn", n = m + 1
IEEE 1284.3 device	PDO	None	"\Device\Parallelm.x", m >= 0, Windows 2000: x = 0 to 3 Windows XP and later: x = 0 or 1	"LPTn.x", n = m +1
IEEE 1284 end-of-chain device	PDO	None	"\Device\Parallelm.4" m >= 0	"LPTn.4" n = m +1

For example, the following device names and symbolic links are assigned to "\Device\ParallelPort0", which has two IEEE 1284.3 daisy chain devices and an IEEE 1284 end-of-chain device attached to it.

Device type	Device object	Internal name	Symbolic link
Parallel Port	FDO	"\Device\ParallelPort0"	None
IEEE 1284.3 device	PDO	"\Device\Parallel0.0"	"LPT1.0"
IEEE 1284.3 device	PDO	"\Device\Parallel0.1"	"LPT1.1"
IEEE 1284 end-of-chain device	PDO	"\Device\Parallel0.4"	"LPT1.4"