Datamax E-Class Mark II Programmer's Manual page 274

Appendix J – General Purpose Input Output Port Applications
GPI/O B (J2)
Six unassigned inputs are designed to interface to open-collector outputs. These inputs
require no external pull-ups and blocking diodes allow the use of totem pole outputs from
+4.5 to + 26 VDC. Optical isolators are available to provide isolation. Two print control
interface circuit examples are given below.
• For direct inputs –
Use the printer's +5VDC and Ground to supply
the devices interfacing to the GPI/O B inputs
(as shown, right).
• For electrically-isolated inputs –
To provide galvanic isolation for the GPI/O B
inputs, remove jumper JMP 11 then supply an
external +5VDC source voltage to Pin 1, and
remove jumper JMP 10 then supply an
external Ground to Pin 6 (as shown, right).
Six unassigned outputs are programmable and slew-limited. Optional 10K ohm pull-up
resistors, one for each of the output lines, can be used at either +5 or +24 VDC via jumpers
JMP 2 – 7.

To avoid damage if external pull-up resistors are used (that is, when Jumpers JMP 2 - 7 are
not installed), ensure that the external voltage does not exceed +30VDC.
The table below details the GPI/O B pin assignments, settings and functions:
Class Series 2 Programmer's Manual
GPI/O B - J2
Input 1
13
Input 2
8
Input 3
3
Input 4
12
7 Input 5
2
Input 6
Ground
6
+5 VDC External Source
GPI/O B - J2
1 Vcc
Input 1
13
Input 2
8
Input 3
3
Input 4
12
7 Input 5
2 Input 6
6 Ground
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