Appendix J – General Purpose Input Output Ports
Class Series Programmer’s Manual 236
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).
GPI/O B - J2
8
3
12
7
Input 1
Ground
13
Input 2
Input 3
Input 4
6
Input 5
Input 6
2
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).
1
Vcc
+5 VDC External Source
GPI/O B - J2
8
3
12
7
Input 1
13
Input 2
Input 3
Input 4
Input 5
Input 6
2
Ground
6
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.
Note: 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:
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