Uart Interface - Huawei ME909s Series Hardware Manual

HUAWEI ME909s Series LTE Mini PCIe Module
Hardware Guide
Figure 3-8 shows the recommended circuits of the LED_WWAN# pin. According to
LED feature, you can adjust the LED brightness by adjusting the resistance of resistor
R. The mode indicator (LED_WWAN#) is current sink. Drive strength: 10 mA.
Figure 3-8 Driving circuit

3.5 UART Interface

The ME909s Mini PCIe module provides the UART (4-wire UART) interface for one
asynchronous communication channel. As the UART interface supports signal control
through standard modem handshake, AT commands are entered and serial
communication is performed through the UART interface. The UART have the
following features:
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Table 3-5 lists the UART interface signals.
Issue 02 (2016-09-07)
The voltage level of the LED_WWAN# pin is controlled by AT^LEDCTRL. Its states are as listed
in Table 3-4 only when the indicator is turned on and runs Huawei's default blinking scheme.
Full-duplex
7-bit or 8-bit data
1-bit or 2-bit stop bit
Odd parity check, even parity check, or non-check
Baud rate clock generated by the system clock
Direct memory access (DMA) transmission
UART supports baud rate: 300 bit/s, 600 bit/s, 1200 bit/s, 2400 bit/s ,4800 bit/s,
9600 bit/s, 19200 bit/s, 38400 bit/s, 57600 bit/s, 115200 bit/s (default), 230400
bit/s, 1000000 bit/s, 3000000 bit/s
Baud rate auto adaptive change is supported. AP must choose one default Baud
rate to communicate with module in the beginning.
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Description of the Application Interfaces
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