COMMELL LE-37D - Manual (Page 27)

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Step 6.
Press down and slide the cap to the CLOSE position.
Be sure that the cap is tightly held with the slot.
2.13
The board provides a programmable 8-bit digital I/O interface; you can use this general
purpose I/O port for system control like POS or KIOSK. The GPIO is an Open-drain
output and TTL-level input .
1. Output： Open-drain , Most applications need use an external pull-up resistor .
2. Input： TTL-level.
DC characteristics:
Connector: CN_DIO
Type: 12-pin (6 x 2) header (pitch = 2.0mm)
Pin Description Pin Description
1 Ground 2 Ground
3 GPIO0 4 GPIO4
5 GPIO1 6 GPIO5
7 GPIO2 8 GPIO6
9 GPIO3 10 GPIO7
11 5V 12 12V
5V TTL-level Input Pin
Parameter Sym Min Typ Max Unit Conditions
Input Low Voltage V
IL
0.8 V
Input High Voltage V
IH
2.0 V
Input High Leakage I
LIH
+10 μA V
IN
= 3.3V
Input Low Leakage I
LIL
-10 μA V
IN
= 0V
Open-drain output pin with 12-mA sink capability
Output Low Voltage V
OL
0.4 V I
OL
= 12 mA