Avision DS310F, User Manual

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Question: Why some parallel port devices and software’s
keypro do not work with the DS310F?
Answer: The DS310F do pass-through printing all right , but
the pass-through printing may not work if you
connect the parallel port with devices other than
printer. Therefore, if you would like to connect
some parallel port devices other than printer, please
do not connect them to the same parallel port that
the DS310F currently uses. It is suggested to use
other parallel ports to connect these devices or
keypro. For instance, you can connect the DS310F
to LPT1, and connect other parallel port devices to
LPT2. Or you can add a data switch to avoid the
problem.