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18 - NC - Not used
19−30 - NC - Twisted-pair return signal
ground level
31 - INIT IN When this signal level goes
Low, the scanner is reset to
its power-up state. This
level is usually High. The
pulse width must be more
than 50 microseconds at
the receiving terminal.
32 - NC - Not used
33 - GND - Twisted-pair return signal
ground level
34−35 - NC - Not used
36 - DIR IN Low indicates the input
direction
❏ ‘‘Return’’ denotes the twisted-pair return, to be connected at
signal ground level. For interface wiring, be sure to use a
twisted-pair cable for each signal, and to complete the
connection on the return side. These cables should be
shielded and connected to the chassis of the host computer
and the scanner.
❏ All interface conditions are based on TTL level.
A-6 Interface Specifications