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L710HG EVB User Manual
Copyright© Shanghai Mobiletek Communication Ltd 12
5 Application interface
5.1 UART DB9 Interface
There is a DB9 COM port on the L710HG development board, and its signal pin is consistent with
the signal on the L710HG module. The serial interface as the main serial port can support
complete 9 - line RS232. The COMS 1.8v level on the L710HG module is converted to the
standard RS232 level via serial port level conversion chip SP3238. Users can connect to PC or
other terminal devices through DB9 serial port cable provided for serial port communication.
Main serial port (this function has not been opened yet) supports hardware flow control for AT
instruction, data transmission, etc. When using, you need to dial the switch S4 to the right as
shown in the arrow direction below.
Figure5-1: L710HG RS232 (DB9) Port
Note: .About the serial port baud rate associated Settings, please refer to L710HG
software user manual.
5.2 USB
（
AT UART
）
Interface
In addition to the DB9 serial port described in 5.1 for AT communication, L506_EVB_V3 also
provides a set of USB virtual serial ports with exactly the same functions as DB9 serial ports for
AT instruction and data transmission. In use, also need to wave switch S4 to the right. DB9 serial
port function is turned off after USB cable is plugged in. AT instruction and other functions can
only be completed through this serial port.