Uart Interface; Uart Design Guide - SimCom SIM7000 Hardware Design

3.3

UART Interface

SIM7000 provides a 7-wire UART (universal asynchronous serial transmission) interface as DCE
(Data Communication Equipment). AT commands and data transmission can be performed through
this UART interface.
In DAM (Downloadable Application Module) application, SIM7000 provides a UART interface to
use. This UART multiplexed from GPIO. The GPIO0 multiplex as TXD and the GPIO1 multiplex
as RXD. This UART interface can't use as AT port or data transmission. It is only used as UART in
DAM application when secondary development.
SIM7000 support high speed UART, the baud rate is up to 4Mbps. The communication baud rates
include:0,300,600,1200,2400,4800,9600,19200,38400,57600,115200,230400,921600,2000000 ,300
0000,3200000,3686400 bps. The rate 0bps mark auto baud rate. And it supports auto baud rate, but
the rate only supported on
rate, it needs to switch via
3.3.1

UART Design Guide

The following figures show the reference design.
MODULE ( DCE)
Serial port
UART _ DTR
UART _ DCD
UART1_RI
MODULE ( DCE)
SIM7000 _Hardware Design _V1.04
9600, 19200, 38400, 57600, 115200. If users need to change to other baud
manual operation.
TXD
RXD
RTS
CTS
Figure 13: UART full modem
TXD
RXD
RTS
CTS
UART
DTR
DCD
Wake up host
RI
Figure 14: UART null modem
Smart Machine Smart Decision
CUSTOMER (DTE)
Serial port
TXD
RXD
RTS
CTS
DTR
DCD
RING
HOST ( DTE)
TXD
RXD
RTS
UART
CTS
DTR
DCD
RING
Interrupt
2018-1-31