16
RS232 Interface
There is one onboard RS232 chip from SIPEX, it is used to convert 3.3V COMS signals
to RS232 signal, normally, RS232 interface provide one DB9 connector to communicate with
external DTE, for instance, connect to PC serial port.
Chart 2-11. DB9 Pin Information
Sheet 2-6. Signal Description of RS232 Interface
Mark：1. Pin not listed in the above sheet is not used by evaluation board
2. Recommend to make the shield of DB9 connect to ground
Power
On board DC JACK with internal size : 2.0mm,，power circuit support pole protection，
input voltage arrange:7.5V~12V。adjustable power chips are LM2596 DC-DC and
LM1117-3.3V LDO from SIPEX。
Selectable Channel Switch
The Evaluation board provide 8bits DIP16/8 switch to select neport1 or neport2 to
communicate with external rs232 interface. Push switch to ON will enable the corresponding
signal.
Attention：
1. User just can enable one group of this 8bits switch,(group 1:one:1-4 , Group 2:5-8), or
Evaluation board can’t communicate with external rs232 devices
2. When all of 8bits switch are disconnected or one group are disconnect but no neport
on the other group, such setting may cause no signal output to rs232
8Pin/2.0 pitch header
The Evaluation board provides 8pins pitch header for OEM/ODM customized
development, and this pitch header can make neport signals connect to user’s MCU/DSP
efficiently to debug or testing according to the real application
Attention：
Should disconnect the extern rs232 interface to avoid effect testing result
Buttons
The Evaluation Board integrates three buttons used as reset / defaulting setting
NePort Signal
Terminal Device（DTE）
DB9 Pin #
Signal Name
DB9 Pin #
Signal Name
2
RXD
2
TXD
3
TXD
3
RXD
5
GND
5
GND
7
RTS
7
CTS
8
CTS
8
RTS
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