Hardware Guide

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FIBOCOM MC116-NA Series Hardware Guide Page 35 of 63
5.5 UART Interface
5.5.1 UART Interface Definition
MC116-NA 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 rates.
The default baud rate is 115200bps, used for data transmission and AT command transmission.
Debug serial port supports 115200bps baud rate for FIBOCOM internal debug. Table 5-10 and table 5-11
are the pin definition of main serial port and debug serial port.
Table 5-10 Main serial port
Pin Name I/O Pin Num Description
RI O 62 Ring indicator
DCD O 63 Data carrier detection
CTS I 64
Clear to send
RTS O 65
Request to send
DTR I 66 Data ready, sleep mode control
TXD O 67 Module Transmit data
RXD I 68 Module Receive data
Table 5-11 Debug serial port
Pin Name I/O Pin Num Description
DBG_RXD I 11 Module Receive data
DBG_TXD O 12 Module Transmit data
5.5.2 UART Port Application
The serial port level of MC116-NA series module is 1.8V, if the level of the client host system is 3.3V or
other, level
translator
needed between the module and the host. The reference design circuit of level
translator is shown as follows
: