NL865H2 Hardware Design Guide
1VV0301616 Rev. 7
Page
35
of
67
2020-04-20
Communication ports
The NL865H2-W1 module is provided with by 2 Asynchronous serial ports:
• MODEM SERIAL PORT 1 (Main)
• MODEM SERIAL PORT 2 (Auxiliary)
Several configurations can be designed for the serial port on the OEM hardware, but the
most common are:
• RS232 PC com port
• microcontroller UART @ 1.8V (Universal Asynchronous Receive Transmit)
• microcontroller UART @ 5V or other voltages different from 1.8V
Depending from the type of serial port on the OEM hardware a level translator circuit may
be needed to make the system work. On the NL865H2-W1 the ports are CMOS 1.8.
5.2.1.1.
Modem serial port 1
The serial port 1 on the NL865H2-W1 is a +1.8V UART . It differs from the PC-RS232 in
the signal polarity (RS232 is reversed) and levels. The following table is listing the
available signals:
RS232
Pin
Signal
NL865H2 PAD
Name
Usage
1
C109/DCD
1
Data Carrier Detect
Output from the NL865H2 that indicates
the carrier presence
2
C104/RXD
10
Transmit line *see
Note
Output transmit line of NL865H2 UART
3
C103/TXD
9
Receive line *see
Note
Input receive of the NL865H2 UART
4
C108/DTR
4
Data Terminal Ready
Input to the NL865H2 that controls the DTE
READY condition
6
C107/DSR
3
Data Set Ready
Output from the NL865H2 that indicates
the module is ready
7
C106/CTS
5
Clear to Send
Output from the NL865H2 that controls the
Hardware flow control
8
C105/RTS
6
Request to Send
Input to the NL865H2 that controls the
Hardware flow control
9
C125/RING
2
Ring Indicator
Output from the NL865H2 that indicates
the incoming call condition
Содержание NL865H2 Series
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