Huawei Technologies Co. Ltd UM01-HW Manuel D’Utilisation
MC703 CDMA EV-DO Wireless Module V100R001
Product Description
Issue 1.00 (2009-9-10)
Huawei Proprietary and Confidential
Page 27 of 40
Figure 4-1 Connections between the DCE and DTE
UART1_SD
UART1_RD
UART1_XRS
UART1_XCS
UART1_XER
UART1_XDR
UART1_XCD
UART1_XCI
SD
RD
XRS
XCS
XER
XDR
XCD
XCI
DCE
DTE
MU203
Application
Table 4-1 shows the definitions of the interface signals.
Table 4-1 Signals on UART1 of the UM01-HW UMTS module
Pin
Number
Number
Signal
Name
Name
Description
Feature
Direction
27 UART1_RD
Data
transmission
end of the module
The Date Terminal
Equipment (DTE)
receives serial data.
Equipment (DTE)
receives serial data.
DCE–DTE
23
UART1_SD
Data receiving end
of the module
of the module
The DTE transmits
serial data.
serial data.
DTE–DCE
22 UART1_XCI
Ringing indication
of the module
of the module
The DTE is notified of
a remote call.
a remote call.
DCE–DTE
20 UART1_XC
S
This device’s
permission to send
permission to send
The DTE notifies the
Data Communications
Equipment (DCE) of
sending requests.
Data Communications
Equipment (DCE) of
sending requests.
DCE–DTE
28 UART1_XE
R
DTE ready signal
The DTE is ready.
DTE–DCE
24 UART1_XD
R
This device’s ready
signal
signal
The DCE is ready.
DCE–DTE
26 UART1_XR
S
DTE send request
signal
signal
The DCE switches to
the receiving mode.
the receiving mode.
DTE–DCE
30 UART1_XC
D
Carrier detection
signal
signal
Data links are
connected.
connected.
DCE–DTE