Holux V1.02 - Manual (Page 18)

8
GPSmile52
Using the stylus
This unit can be controlled easily though the touch screen. The stylus is an
assist tool for operating this unit and is concealed in a pen slot at the rear.
Pull out to use.
I/O interface
The I/O interface has five pins, and each pin function is described as below.
Pin Function
1 VCCIN (DC 5.4 ± 0.2 1A)
2 TX
Serial Data output port A (TTL
Level；Voh≧2.4V，
Vol≦0.4V; Ioh=Iol=2mA)
3 RX
Serial Data input port A(TTL
Level；Vih≧0.7*VCC；
Vil≦0.3*VCC)
4 GND
5 Outside device (Reserve of
software program definition.)
Stylus
1 2 3 4 5