Data Sheet

Smart Machine Smart Decision

SIM800F_Hardware Design_V1.00 29 2015-07-31

4.6 Serial Port and USB Interface

Table 8: Serial port and USB pin definition

Note:

1. Hardware flow control is disabled by default. The AT command “AT+IFC=2,2” can enable hardware flow control .The AT

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

[1]

2. Pin 68 &51 are configured as GPIO by default. AT command “AT+CMNRP=1” can set them to be serial port UART2.

Table 9: Serial port characteristics

Symbol Min Max Unit

-0.3 0.7 V

2.1 3.1 V

- 0.4 V

2.4 - V

4.6.1 Function of Serial Port

Serial port UART1:

 Support modem device

 Contain data lines UART1_TXD, UART1_RXD,hardware flow control lines UART1_RTS, UART1_CTS

and status lines UART1_DTR, UART1_DCD, UART1_RI

 Serial port can be used for GPRS service and AT communication

 Serial port supports the following baud rates

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

 The default setting is auto baud detection

Serial port UART2:

 Support AT command

Name Pin number Function

UART1_DTR 3 Data terminal ready

UART1_RI 4 Ring indicator

UART1_DCD 5 Data carrier detect

UART1_CTS 7 Clear to send

UART1_RTS 8 Request to send

UART1_TXD 9 Transmit data

Serial port UART1

UART1_RXD 10 Receive data

GPIO12 68 Compatible with UART2_TXD, Transmit data Serial port UART2

(enabled by command)

GPIO10 51 Compatible with UART2_RXD, Receive data

USB_VBUS 24 USB power supply

USB_DP 27 USB data line plus

USB interface

USB_DN 28 USB data line minus