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HUAWEI MC509 CDMA LGA Module
Hardware Guide
Description of the Application Interfaces
Issue 01 (2011-04-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
32
Table 3-8 UART interface signals
Pin
No.
Pin Name
I/O
Description
Feature
DC Characteristics (V)
Min
Typical
Max
76
UART_TX
O
Data sending on the
wireless module
The DTE receives
serial data.
-0.3
2.6
2.9
78
UART_RX
I
Data receive end of
the module
The DTE transmits
serial data.
-0.3
2.6
2.9
77
UART_RIN
G
O
Ringing indication on
the wireless module
The DTE is notified of
a remote call.
-0.3
2.6
2.9
74
UART_RTS
O
Data sending request
on the wireless
module
The DTE notifies the
DCE of sending
requests.
-0.3
2.6
2.9
79
UART_DTR
I
Data terminal ready
on the wireless
module
The DTE is ready.
-0.3
2.6
2.9
80
UART_CTS
I
Clearing to send on
the wireless module
The DCE switches to
the receiving mode.
-0.3
2.6
2.9
75
UART_DCD
O
Data carrier
detection on the
wireless module
Data links are
connected.
-0.3
2.6
2.9
73
UART_DSR
O
Data ready on the
wireless module
The DCE is ready.
-0.3
2.6
2.9
3.5.2 Circuit Recommended for the UART Interface
Figure 3-7 shows the connection of the UART interface in the MC509 module (DCE)
with the host (DTE).