Huawei MG323 manual Circuit Recommended for the Uart Interface

HUAWEI MG323 GSM M2M Module
Hardware Guide				Description of the Application Interfaces
	Pin No.	Signal Name	Description	Feature	Direction
	33	UART1_TD	DCE receive	The DTE transmits	DTE to DCE
			data	serial data.
	38	UART1_RING	DCE ring	The DCE notifies	DCE to DTE
			indicator	the DTE of a
				remote call.
	32	UART1_DTR	DCE data	The DTE is ready.	DTE to DCE
			terminal ready
	34	UART1_RTS	DCE request to	The DTE requests	DTE to DCE
			send	the DCE to send
				data.
	36	UART1_DSR	DCE data set	The DCE is ready.	DCE to DTE
			ready
	28	UART1_CTS	DCE clear to	The DCE has	DCE to DTE
			send	switched to the
				data receiving
				mode.
	24	UART1_DCD	DCE data	A data link is set	DCE to DTE
			carrier detect	up.

3.6.2Circuit Recommended for the UART Interface

Figure 3-8shows the connection of the UART1 interface in the MG323 module (DCE) with the host (DTE).

Figure 3-8Connection of the UART1 interface in the MG323 module (DCE) with the host (DTE)

When an MG323 module receives an SM (Short Message), a low-level signal is output through the RING (pin 38) for 1s, as shown in Figure 3-9 .

Issue 06 (2013-06-13)	Huawei Proprietary and Confidential	24
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