Datamax H-Class Manual page 8

GPI/O B (J2)
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Six unassigned inputs are designed to interface to open-collector outputs. These
inputs require no external pull-ups, while blocking diodes allow the use of totem pole
outputs from +4.5 VDC to + 26 VDC. Optical isolators provide galvanic isolation. Two
print control interface circuit examples are given below.
For direct inputs:
Use the printer's +5VDC to supply the devices
interfacing to the GPI/O B inputs (as shown in
the sample circuit, right).
For 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 in the
sample circuit, right).
Six unassigned outputs have slew-limited signal-edge rise and fall times to
prevent cross talk in the cabling. 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.
Note: If external pull-ups are employed (that is, when Jumpers JMP 2 - 7 are

not installed), ensure that the applied external voltage does not exceed
+30VDC.
The table below details the GPI/O B pin assignments, settings and functions.
+5 VDC External Source
6
GPI/O B - J2
13 Input 1
Input 2
8
Input 3
3
Input 4
12
7 Input 5
2 Input 6
6 Ground
GPI/O B - J2
1 Vcc
13 Input 1
8 Input 2
Input 3
3
Input 4
12
7 Input 5
2 Input 6
6 Ground