45
W&T
2 / 4 Computer Adapter
Subject to error and alteration
EPP/ECP/Bitronics 4 Computer Adapter, Model 25415
The 25415 Adapter allows up to four PC‘s to be connected to a
single printer over a bidirectional parallel interface.
The Adapter electronics are integrated in a Centronics which
can be connected directly to the printer port.
At the input the Adapter is provided with 36-pin Centronics
females, so that the original printer cables can still be used.
Function
The computers are automatically selected on a time-controlled
basis: First any computer is able to print. Whichever PC starts
to print first automatically blocks print output from the other. If
the currently printing computer pauses for approx. 10 seconds
(default setting), the procedure starts over again (who is
printing first gets access to the printer). This pause can be
adjusted to between 5 and 60 seconds using a potentiometer
inside the device. In case of a problem, please check first
whether the printer functions when it is connected directly to
the other computer (without the Adapter).
Important:
In some cases manufacturer-specific Windows
printer drivers communicate continuously and permanently
with the connected printer. This trait must be restricted to the
time of the actual print-out and can generally be set in the
driver software. Continuous communication between the driver
software and printer always locks out the corresponding input
of the converter and makes the printer inaccessible for the
second computer. If access to the printer from this PC is only
possible if you exit Windows on the first computer, this is a
clear indication of such a problem.
