Datamax M-Class Mark II Operator's Manual page 80

Each GPIO pin function is detailed in the table below:
Signal
Pin #
Name
1 Vcc
2 Printer Fault
3 Spare
Start of Print
4
(SOP)
End of Print
5
(EOP)
6 & 8 Signal Ground
7 +24 VDC
[1]
Given relative to the printer.
[2]
The operation of this multi-function port is configuration dependent. For GPIO operation, disable all optional
functions not used (i.e., Present Sensor and Cutter) and set GPIO to "YES" (or on display-equipped models set
GPIO Device to "APPLICATOR"). Use the Configuration Set command (<STX>Kc), or program the selections on
non-display models via the "Printer Setup Menu List" or on display-equipped models via the "Menu System."
Pin 3 should be pulled to +5VDC. In addition, connections
for the external Start of Print control can either be directly
made to Pin 4 of the Option Port (or Main PCB connector)
using a TTL-level input, or via an interface circuit (similar
to the one shown). For more information, see the table
below.
V max
in
V
IH
V
IL
I
OH
I
OL
V
OH
V
OL
Appendix C – Paper Menu Setup
GPIO Port Connections and Functions
Signal Signal
State Direction
+5 VDC Output
Low Output
Reserved Input
Programmable Input
Programmable Output
Ground N/A
500mA Output
Sample SOP Circuit
GPIO Port Specifications
5.5 VDC maximum input into any pin
3.8 VDC minimum (high level input voltage)
0.36 VDC maximum (low level input voltage)
-8 mA typical, - 25 mA maximum (high level output current)
8 mA typical 25 mA maximum (low level output current)
I = -8 mA, minimum 3.8 VDC
OH
I = 8 mA, maximum .44 VDC
OL
Signal Description
[1]
Printer: Max +5 VDC, 100mA
Goes low upon printer detection of a fault
condition. Max +5 VDC, 100mA
Must be pulled high with 1k Ohm resistor
(see sample SOP circuit, below).
When active, will begin print. Recommend
only setting this signal to ACTIVE LOW. When
ready to print a label, the applicator should
hold this signal low for at least 50ms – or
until EOP goes not active. See sample SOP
circuit, below. Max +3.27 VDC, +/-5mA
Signifies the end of the print process. Can be
monitored to initiate next Start of Print
sequence. Minimum signal time 30ms. Max
+5 VDC, 100mA
Ground
Printer: Max +24 VDC, 500mA
GPIO Connector Pin Number
[2]
Vcc 1
1K O
1K O
Spare 3
SOP 4
Gnd 8
74