SimCom SIM7000 User Manual

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

SimCom SIM7000 Specifications

General

Brand	SimCom
Model	SIM7000
Category	GSM/GPRS Modules
Language	English