User's Manual

Page 18 of 31
shown in Figure 2-11。J401 is a 9 needle serial port plugs，we can use it to connect U6300 and PC.
2）For avoiding the electro-static, it is recommended to use the ESD element to the signal line of the UART socket. Just
like the voltage dependent resistors RV401, RV402, RV403, RV404 and RV405 in figure 2-11.And the ESD
element should close to the socket as close as possible.
Figure 2-12 The reference circuit of UART interface
2.2.8 LED control
2.2.8.1 Description
There is a pins for LED control in the Mini PCIe Interface. And the detail information is given in table 2.13 below.
Table 2.13 U6300 LED control description
And the U6300 status displayed by LEDs is listed in table 2.14 below.
Table 2.14 LED display description
LED S tatus Description
Green
Flicker quickly (
100ms On/800ms Off)
Networks searching
The name of the
correlative pins in
Mini PCIe Interface
SN. of the Mini PCIe
Interface
Description
LED_WWAN 42 Led control Signal