Brady Tagus User Manual page 173

Connections for an external Start of Print control can be made
(1) directly to Pin 4 using a TTL-level input or (2) with an
interface circuit similar to the one shown here (for additional
interfacing data, see the table below).
V max
in
V
IH
V
IL
I
OH
I
OL
V
OH
V
OL
GPIO Port Description
External Start of Print Control Circuit Sample
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
F-3 Rev A