Specifications

M80 Hardware Design
M80_HD_V1.0 - 48 -
Host(DTE)
controller
TXD
RXD
GND
Module(DCE)
RTS
CTS
RTS
CTS
GND
RXD
TXD
UART PORT
Figure 20: Connection of UART port associated hardware flow control
3.9.1.3. Software upgrade
The TXD, RXD can be used to upgrade software. The PWRKEY pin must be pulled down before
the software upgrade. Please refer to the following figures for software upgrade.
IO Connector
TXD
RXD
GND
PWRKEY
Module (DCE)
UART Port
TXD
RXD
GND
PWRKEY
Figure 21: Connection of software upgrade
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