Specifications

M80 Hardware Design
M80_HD_V1.0 - 44 -
Figure 17: Seiko XH414H-IV01E Charge Characteristics
3.9. Serial interfaces
The module provides three serial ports: UART, Debug Port and Auxiliary UART Port. The
module is designed as a DCE (Data Communication Equipment), following the traditional
DCE-DTE (Data Terminal Equipment) connection. Autobauding function supports baud rate from
4800bps to 115200bps.
The UART Port:
 TXD: Send data to RXD of DTE
 RXD: Receive data from TXD of DTE
 RTS: Requests to send
 CTS: Clear to send
 DTR: DTE is ready and inform DCE (this pin can wake the module up)
 RI: Ring indicator (when the call, SMS, data of the module are coming, the module will
output signal to inform DTE)
 DCD: Data carrier detection (the valid of this pin demonstrates the communication link is set
up)
The module disables hardware flow control in default. When hardware flow control is required,
RTS and CTS should be connected to the host. AT command “AT+IFC=2,2” is used to enable
hardware flow control. AT command “AT+IFC=0,0” is used to disable the hardware flow
control. For more details, please refer to document [1].
The Debug Port
 DBG_TXD: Send data to the COM port of a debugging computer
 DBG_RXD: Receive data from the COM port of a debugging computer
Quectel
Confidential