Rice Lake Datamax M-Class - Manual (Page 159)

M-Class 151
External Start of Print Control Circuit Sample
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).
1
4 SOP
8 Gnd
1K
Vcc
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