GT-1612-MTBD
GPS&Beidou Receiver Module
www.gotop-zzu.com
Page 17 of 35
Revision: V2.0.1-January 2015
2.5. UART Interface
The module provides one universal asynchronous receiver& transmitter serial port. The module is designed as
DCE (Data Communication Equipment), following the traditional DCE-DTE (Data Terminal Equipment) connection.
The module and the client (DTE) are connected through the signals shown in the following figure. It supports data
baud-rate from 4800bps to 115200bps.
UART port:
TXD: Send data to the RXD1 signal line of DTE.
RXD: Receive data from the TXD1 signal line of DTE.
Figure 10:
Connection of Serial Interfaces
This UART port has the following features:
UART port can be used for firmware upgrade, NMEA output and PMTK proprietary commands input.
The default output NMEA type setting is RMC, VTG, GGA, GSA, GSV, GLL and GPTXT (MTK proprietary
protocol).
UART port supports the following data rates:
4800, 9600, 14400, 19200, 38400, 57600, 115200bps.
The default setting is 9600bps, 8 bits, no parity bit, 1 stop bit.
Hardware flow control and synchronous operation are not supported.
The UART port does not support the RS-232 level but only CMOS level. If the module’s UART port is connected
to the UART port of a computer, it is necessary to add a level shift circuit between the module and the computer.
Please refer to the following figure.
