Uart Interfaces; Main Uart Interface - Quectel LTE-A Series Hardware Design

3.10. UART Interfaces

The module provides three UART interfaces: main UART interface, debug UART interface, and BT UART
interface. Features of these interfaces are shown as below:

Main UART interface supports 4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps
(default), 230400bps, 460800bps, and 921600bps baud rates. It is used for data transmission and AT
command communication. And it supports RTS and CTS hardware flow control.

Debug UART interface supports 115200bps baud rate. It is used for Linux console and log output.

BT UART interface supports 115200bps baud rate. It is used for BT communication and can be
multiplexed into SPI interface*.
NOTE
"*" means under development.

3.10.1. Main UART Interface

The following table shows the main UART interface pin definition.
Table 12: Pin Definition of Main UART Interface
Pin Name Pin No.
CTS 56
RTS 57
RXD 58
DCD 59
TXD 60
RI 61
DTR 62
EG18_Hardware_Design
I/O Description
DO Clear to send
DI Request to send
DI Receive data
DO Data carrier detection
DO Transmit data
DO Ring indication
Data terminal ready,
DI
sleep mode control
LTE-A Module Series
EG18 Hardware Design
Comment
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
1.8V power domain
50 / 104