120 I-Class
GPIO Pin Conf ig uratio n
(as viewed from the rear of the printer)
External Start of Print Control
Connections for an external Start
of Print control can be made (1)
directly to Pin 8 usi ng a TTL-
level input or (2) with an
interface circuit similar to the
one shown right. For additional
interfacing requirements, see the
table below.
GPIO Port Specifications*
V
in
max 5.5 VDC maximum input into any pin
V
IH
3.8 VDC minimum (high level input voltage)
V
IL
1.65 VDC maximum (low level input voltage)
I
OH
-8 mA typical, - 25 mA maximum (high level output current)
I
OL
8 mA typical 25 mA maximum (low level output current)
V
OH
I
OH
=
-8
mA, minimum 3.8 VDC
V
OL
I
OL
=
8
mA, maximum .44 VDC
*See the SN74AHC244 data sheet for more information.
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