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HUAWEI MG323 GSM M2M Module
Hardware Guide
Description of the Application Interfaces
Issue 06 (2013-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
24
Pin No. Signal Name Description Feature Direction
33 UART1_TD
DCE receive
data
The DTE transmits
serial data.
DTE to DCE
38 UART1_RING
DCE ring
indicator
The DCE notifies
the DTE of a
remote call.
DCE to DTE
32 UART1_DTR
DCE data
terminal ready
The DTE is ready. DTE to DCE
34 UART1_RTS
DCE request to
send
The DTE requests
the DCE to send
data.
DTE to DCE
36 UART1_DSR
DCE data set
ready
The DCE is ready. DCE to DTE
28 UART1_CTS
DCE clear to
send
The DCE has
switched to the
data receiving
mode.
DCE to DTE
24 UART1_DCD
DCE data
carrier detect
A data link is set
up.
DCE to DTE
3.6.2 Circuit Recommended for the UART Interface
Figure 3-8 shows the connection of the UART1 interface in the MG323 module (DCE)
with the host (DTE).
Figure 3-8 Connection 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 .