User's Manual

HE910 Hardware User Guide

1vv0300925 Rev.9 – 07-02-2012

NOTE:

According to V.24, some signal names are referred to the application side, therefore on

the HE910 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)

NOTE:

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.

NOTE:

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 HE910 when the module is powered

off or during an ON/OFF transition.