Datamax a-class mark ii Operator's Manual page 144

GPI/O A (J1)
Four dedicated inputs are available for control of printer functions. These inputs require no
external pull-ups, are designed to interface to open-collector outputs and accept totem pole
outputs from +4.5 to + 26 VDC. Optical isolators are available to provide isolation. Two print
control circuit examples are given below.
For direct inputs –
Use the printer's +5VDC and Ground to supply the
devices interfacing to the GPI/O A inputs (as
shown, right).
For isolated inputs –
To provide galvanic isolation for the GPI/O A
inputs, remove jumper JMP 9 then supply an
external +5VDC source voltage to Pin 2, and
remove jumper JMP 8 then supply an external
Ground to Pin 1 (as shown, right).
Seven dedicated outputs are available for control, warning, and error functions. These open-
collector outputs are slew-limited. Optional 10K ohm pull-up resistors, tied to a common point
for use at either +5 or +24 VDC, are available via jumper JMP 1.
If external pull-up resistors are used (that is, without jumper JMP1 installed),

then to avoid damage ensure that a common external voltage not exceed
+30VDC is used.
The table below details the GPI/O A pin assignments, settings and functions.
134
GPI/O A - J1
3 Start of Print
4 Slew Label
5 Toggle/Pause
6 Reprint
1 Ground
+5 VDC External Source
GPI/O A - J1
2
Vcc
3 Start of Print
4 Slew Label
5 Toggle/Pause
6 Reprint
Ground
1
A-Class