Appendix J – General Purpose Input Output Ports
234 Class Series Programmer’s Manual
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 external +5VDC 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 either +5
or +24 VDC, are available via jumper JMP 1.
Note: To avoid damage if external pull-up resistors are used (that is, without jumper JMP1 installed), ensure that
the external voltage does not exceed +30VDC.
The table below details the GPI/O A pin assignments, settings and functions:
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