User's Manual

User Manual
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4.2.2 Descriptions of UART2 interface
Figure 4-6 UART2 DCE－DTE connection relationship diagram
See the definitions of UART2 interface in table 4-4.
Table 4-4 UART2 interface definitions
Classification
No.
Definitions
I/O
Descriptions
Remarks
UART
43
RXD2
Input
Receiving data
DTE transmits serial data
44
TXD2
Output
Transmitting data
DTE receives serial data
4.3 SIM card interface
ZTE MG2639 module supports 1.8V or 3.0V SIM card. Refer to figure 4-7 for design.