Table of Contents
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Parallel Interface Cable Specification
The table on the following page describes the parallel in-
terface cable that should be used with the QMS printer.
NOTES TO THE TABLE:
1-4
• "Direction" refers to the direction of signal flow
as viewed from the printer.
• "Return" denotes "Twisted-pair Return" and is
to be connected at signal-ground level. When
wiring the interface, be sure to use a twisted-pair
cable for each signal and never fail to complete
connection on the return side. To effectively pre-
vent noise, these cables should be shielded and
connected to the chassis of the system unit and
printer, respectively.
• All interface conditions are based on TTL level.
Both the rise and fall times of each signal must
be less than 0.2 us.
• Data transfer must be carried out by ignoring
the ACKNLG or BUSY signal.
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• The cable must be of the type with an overail
braided shield similar to Belden 8345.
• Connectors must have shielded housings.
• The overall shield must be bonded to the shielded
housings at both ends of the cable.
Printer Specifications
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