NL865H2 Hardware Design Guide
1VV0301616 Rev. 7
Page
36
of
67
2020-04-20
NOTE:
According to V.24, some signal names are referred to the application side,
therefore on the NL865H2 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 NL865H2 when
the module is powered off or during an ON/OFF transition.
5.2.1.2.
Modem serial port 2
The secondary serial port on the NL865H2 is a CMOS1.8V with only the RX and TX
signals. The signals of the NL865H2 serial port are:
PAD
Signal
I/O
Function
Type
NOTE
53
TX_AUX
O
Auxiliary UART (TX Data to DTE)
CMOS 1.8V
52
RX_AUX
I
Auxiliary UART (RX Data from DTE)
CMOS 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 NL865H2 when
the module is powered off or during an ON/OFF transition.
Refer to NL865H2 series AT command reference guide for port
configuration.
Содержание NL865H2 Series
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