134
A-Class
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).
GPI/O A - J1
3
4
5
6
1
Start of Print
Slew Label
Toggle/Pause
Reprint
Ground
For isolated inputs –
To provide galvanic isolation for the GPI/O A
inputs, remove jumper JMP 9 then supply an
ex5VDC source voltage to Pin 2, and
remove jumper JMP 8 then supply an external
Ground to Pin 1 (as shown, right).
3
4
5
6
2
Start of Print
Slew Label
Toggle/Pause
Reprint
Vcc
+5 VDC External Source
GPI/O A - J1
1
Ground
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 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.
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