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I have a printer with LPT port and it needs to be connected to serial COM1 port via adapter. Printer output is being rerouted to serial port COM1 with a command:

mode LPT1=COM1
mode COM1: 9600,n,8,1

and nothing is comming out. Is this possible to accomplish like on this picture in a link below? LPT to serial adapter picture

enter image description here

Vojtěch Dohnal
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Hrvoje T
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2 Answers2

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I think that the adapter you show is a 25-pin to 9-pin serial adapter.

The 25-pin connector was originally developed as a serial interface, but for some reason PC manufacturers chose to use it for the parallel port.

Your adapter allows you to plug a cable with a 25-pin serial connector into the 9-pin connectors PCs use for serial ports, but the signals on the pins of a parallel port are completely different, so it cannot work and could have caused damage to the electronics on one end or the other.

Without a parallel port on your PC, your best bet, as @VojtěchDohnal suggests, is to use a USB to LPT converter, provided there is driver support for it in your OS. There may have been active LPT to serial converters at one time, but I doubt you'll find one now.

AFH
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It is probably not a LPT to serial adapter. Serial port has 2 types of pinouts, of which the 25 pinout is practically the same as parallel port pinout, so you have probably only serial-serial connector instead of parallel to serial adapter. See also this answer.

The parallel printer can be connected to PC with USB cable that is called something like USB to Centronics Printer Cable.

For using the printer form DOS (under Windows) as LPT1 see this answer.

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Vojtěch Dohnal
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