Fibocom L610 Series - 3.6.2 UART Interface Application

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FIBOCOM L610 Series Hardware Guide Page 40 of 59
Note:
Bluetooth data of the module goes to the internal UART2. When using Bluetooth function,
UART2 cannot be used outside.
The following table describes the main serial port pin.
Pin Name
I/O
Pin
Description
RI
O
62
Module output ring indicator
DCD
O
63
Module output carrier detection
RTS
I
64
DTE request to send
CTS
O
65
Module clear to send
DTR
I
66
DTE ready
TXD
O
67
Module Transmit data
RXD
I
68
Module Receive data
The following table describes UART3 pin.
Pin Name
I/O
Pin
Description
UART3_RXD
I
137
Module Receive data
UART3_TXD
O
138
Module Transmit data
The following table describes the debug serial port pin.
Pin Name
I/O
Pin
Description
DBG_RXD
I
11
Module Receive data
DBG_TXD
O
12
Module Transmit data
3.6.2 UART Interface Application
The serial port level of L610 module is 1.8V. If the level of the client host system is 3.3V or other, a level
translator shall be added to the serial port connection between the module and the host. The following
figure shows the reference circuit design using level switching chip: