User's Guide
LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 – Preliminary • 2015-09-02 35 of 68
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NOTE:
According to V.24, some signal names are referred to the application side,
therefore on the LE866 side these signal are on the opposite direction:
TXD on the application side will be connected to the receive line (here named
C103/TXD)
RXD on the application side will be connected to the transmit line (here named
C104/RXD)
For a minimum implementation, only the TXD, RXD lines can be connected, the
other lines can be left open provided a software flow control is implemented.
In order to avoid a back powering effect it is recommended to avoid having any
HIGH logic level signal applied to the digital pins of the LE866 when the module
is powered off or during an ON/OFF transition.