Uart Interface; Uart Interface Definition; Uart Port Application - Fibocom NL668-LA Series Hardware Manual

5.5 UART Interface

5.5.1 UART Interface Definition

NL668-LA series module has two serial ports: the main serial port and debug serial port. The main serial
ports support 4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps, 230400bps baud rate.
The default baud rate is 115200bps, used for data transmission and AT command transmission.
Debug serial port support 115200bps baud rate for FIBOCOM internal debug. Table 5-8 and table 5-9 are
the pin definition of main serial port and debug serial port.
Table 5-10 Main serial port
Pin Name I/O
RI O
DCD O
CTS O
RTS I
DTR I
TXD O
RXD I
Table 5-11 Debug serial port
Pin Name I/O
DBG_RXD I
DBG_TXD O

5.5.2 UART Port Application

The serial port level of NL668-LA series module is 1.8V, if the level of the client host system is 3.3V or
other, level
translator
translator is shown as follows
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FIBOCOM NL668-LA Series Hardware Guide
Pin No.
62
63
64
65
66
67
68
Pin Num
11
12
needed between the module and the host. The reference design circuit of level
:
Description
Ring indicator
Data carrier detection
Request to send
Clear to send
Data ready, sleep mode control
Module Transmit data
Module Receive data
Description
Module Receive data
Module Transmit data
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