Brady 2461 Operator's Manual page 122

Connections for an external Start
of Print control can be made (1)
directly to Pin 8 using a TTL-
level input or (2) with an
interface circuit similar to the
one shown right. For additional
interfacing requirements, see the
table below.
V max
in
V
IH
V
IL
I
OH
I
OL
V
OH
V
OL
*See the SN74AHC244 data sheet for more information.
112
GPIO Pin Configuration
(as viewed from the rear of the printer)
External Start of Print Control
GPIO Port Specifications*
5.5 VDC maximum input into any pin
3.8 VDC minimum (high level input voltage)
1.65 VDC maximum (low level input voltage)
-8 mA typical, - 25 mA maximum (high level output current)
8 mA typical 25 mA maximum (low level output current)
I = -8 mA, minimum 3.8 VDC
OH
I = 8 mA, maximum .44 VDC
OL