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HUAWEI MG323 GSM M2M Module
Hardware Guide
Description of the Application Interfaces
Issue 04 (2011-08-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
20
Table 3-5 UART1 interface signals
Pin No.
Signal Name
Description
Feature
Direction
29
UART1_RD
Data
transmission
end of the
module
The data terminal
equipment (DTE)
receives serial
data.
Data circuit-
terminating
equipment
(DCE) to DTE
33
UART1_TD
Data receiving
end of the
module
The DTE transmits
serial data.
DTE to DCE
38
UART1_RING
Ring indicator of
the module
The DCE notifies
the DTE of a
remote call.
DCE to DTE
32
UART1_DTR
Data Terminal
Ready
The DTE is ready.
DTE to DCE
34
UART1_RTS
Request To
Send
The DTE requests
the DCE to send
data.
DTE to DCE
36
UART1_DSR
Data Set Ready
The DCE is ready.
DCE to DTE
28
UART1_CTS
Clear To Send
The DCE has
switched to the
data receiving
mode.
DCE to DTE
24
UART1_DCD
Data Carrier
Detect
A data link is set
up.
DCE to DTE
3.6.2 Circuit Recommended for the UART Interface
Figure 3-7 shows the connection of the UART1 interface in the MG323 module (DCE)
with the host (DTE).