M7-400 Expansions
12-23
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
12.4.1 LPT1 Parallel Port
Characteristics
The MSM 478 mass storage module has an AT-compatible parallel port (LPT) for
connecting a printer with Centronics interface. The parallel port can also be used
as a bi-directional data interface. There is a 25-pin sub D socket connector on the
frontside of the submodule for plugging in the connecting cable.
This parallel port is always configured by the BIOS as LPT1 regardless of the slot
occupied by the MSM 478 mass storage module.
Addressing
I/O address of the parallel port (LPT): 03BC
H
(to 03BE
H
)
Device name: LPT1
Interrupt Request
The parallel port (LPT) supplies the interrupt request IRQ7.
Pin Assignment of the Parallel Port
There is a 25-pin sub D socket connector on the frontside of the submodule for
plugging in the connecting cable. See Table 12-7 for the pin assignments.
Cable Length
The cable length on the LPT1 parallel port should not exceed approximately 3 m.
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