MEIG SLM770A - 3.11 Serial Port

SLM770A Module Hardware Design Manual
MeiG Smart Technology Co., Ltd 77/77
/7.0 or higher. For ordinary Internet access needs are drive free; For more requirements, such as
sending and receiving AT commands and PPP dialing, the drivers are available. For details, contact
support personnel.
3.11 Serial Port
The SLM770A module has two serial ports: main serial port and debugging serial port. The main
features of these two serial ports are described below.
⚫ Main support serial port, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600, 1M
baud rate, the default baud rate to 115200bps, support the RTS and CTS flow control. Used for data
transmission and AT command transmission;
⚫ The debugging serial port supports 115200bps baud rate and is used to output some logs.
Table 13 Main serial port pin description
Pin name
Pin No.
I/O
Description
Note
RXD
68
DI
Serial port data receiving
1.8V power domain
TXD
67
DO
Serial port data sending
1.8V power domain
DTR
66
DO
Data terminal preparations
1.8V power domain
RTS
65
DO
Send the request
1.8V power domain
CTS
64
DI
Clear to send
1.8V power domain
DCD
63
DI
Carrier detect
1.8V power domain
RI
62
DO
Ring indicator
1.8V power domain
Table 14 Debug serial port pin description
Pin name
Pin No.
I/O
Description
Note
DBG_RXD
11
DI
Module receive data
1.8V power supply domain
DBG_TXD
12
DO
Modules send data
1.8V power supply domain
Table 15 Serial logic level