User's Manual

LE910 Hardware User Guide
1vv0301089 Rev.7 – 25-10-2015
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 57 of 88
11.2 MODEM SERIAL PORT 2 (USIF1)
The secondary serial port on the LE910 is composed by only the RX and TX lines.
The signals of the LE910 serial port are:
PAD
Signal
I/O
Function
Type
COMMENT
D15
TX_AUX
O
Auxiliary UART (TX Data to DTE)
1.8V
E15
RX_AUX
I
Auxiliary UART (RX Data from DTE)
1.8V
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 LE910 when the module is powered off or during
an ON/OFF transition.