Telit Wireless Solutions HE910 - Page 80

HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 80 of 111 2019-11-25
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.