COMMELL LV-67O - Manual (Page 28)

LV-67O User’s Manual
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Step 4.
Insert a SIM card as shown in the photo.
Be sure that the corner cut is on top and the golden pads are up.
Step 5.
Now, flip down the cap as shown in the photo.
Step 6.
Press down and slide the cap to the CLOSE position. Be sure that the cap is tightly held
with the socket.
2.12
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: