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Table 9: Serial port and USB pin definition

Pin name

Pin number Function

DTR

Data terminal ready

Ring indicator

DCD

Data carrier detect

CTS

Request to send

RTS

Clear to send

TXD

Transmit data

Serial port

RXD

Receive data

VBUS

USB power supply

USB_DP

Debug port

USB_DN

Note: Hardware flow control is disable by default. AT command “AT+IFC=2,2”can enable hardware flow control. AT command

“AT+IFC=0,0”can disable hardware flow control. For more details please refer to document [1].

Table 10: Serial port characteristics

Symbol

Min

Typ

Max

Unit

VIL

-0.3

0.7

VIH

2.1

3.1

VOL

0.4

VOH

2.4

2.8

SIM800H&SIM800L module can support dual serial port function, that need execute AT command

"AT+CMNRP=1"first. Dual serial port including one full modem serial port and one three-wire serial port, pin

definition is different with standard definition of the Figure 2: Pin assignment (Top view) and Table 5: Pin

description. For more details please refer to Document [2].

Note: Only B05 and later version support dual serial port function.

4.5.1

Function of Serial Port

Serial port:

Full mode device.

Contains data lines TXD and RXD, hardware flow control lines RTS and CTS, status lines DTR, DCD and

RI.

Serial port can be used for CSD FAX, GPRS service and AT communication. It can also be used for

multiplexing function. For details about multiplexing function, please refer to table 11.

Serial port supports the following baud rates:

1200, 2400, 4800, 9600, 19200, 38400, 57600,115200,230400 and 460800bps

Autobauding only supports the following baud rates:

SIM800H&SIM800L_Hardware Design_V2.02

2015-07-27

SIM800L データシート(PDF) 29 Page - SIMCom

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