... , user-friendly core board used independently. In order to reliably connect with the floor, the core board with 170 square feet ... follows: 1, USB HOST interfaces; 2, USB Device Interface 3 way 232, 3-way TTL serial port; 4,100 M network interface ... -bit code switch BOOT Stubbs; 17, SIM300 GPRS module interface 18, SIRFIII GPS module interface (including the antenna interface);19, Hayward WIFI ...