HUAWEI MG323 GSM M2M Module
Description of the Application Interfaces
Issue 06 (2013-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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Figure 3-7 Driving circuit
3.6 UART Interface
3.6.1 Overview
The MG323 module provides the UART1 (8-wire UART) interface for one
asynchronous communication channel. As the UART1 interface supports signal
control through standard modem handshake, AT commands are entered and serial
communication is performed through the UART1 interface. The UART1 has the
following features:
Full-duplex
Baud rate clock generated by the system clock
Direct memory access (DMA) transmission
Baud rate ranging from 9600 bit/s to 230400 bit/s (115200 bit/s by default)
Self-adapted baud rate ranging from 9600 bit/s to 115200 bit/s
Table 3-6 lists the UART1 interface signals.
Table 3-6 UART1 interface signals
Pin No. Signal Name Description Feature Direction
29 UART1_RD
DCE transmit
data
The data terminal
equipment (DTE)
receives serial
data.
Data circuit-
terminating
equipment
(DCE) to DTE
