AHD Mobile DVR Hardware User Manual T4
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7.3 Serial ports connection
The device provides a group of serial ports which are used to connect with some
user’s peripherals, the interface is LVTTL (3.3V) level
Figure 21. Serial ports Connection
I/O wires
Peripherals
PIN
Definition
Color
Color
Definition
2
Ground
Black
Black
Ground
8
TXD(TTL
level)
White
Yellow
RXD
10
RXD(TTL
level)
Yellow
White
TXD
Serial ports connection