Chengdu Ebyte Electronic Technology Co., Ltd.
NB144 User Manual
Copyright ©2012
，
Chengdu Ebyte Electronic Technology Co., Ltd.
11
3.2 Interface Description
serial
number
name
Function
illustrate
1
R S232-4
Serial port 4 -RS232
interface
Standard DB9 female, 2 -TXD , 3 -RXD , 5-
GND
2
R S232-3
Serial port 3 -RS232
interface
Standard DB9 female, 2 -TXD , 3 -RXD , 5-
GND
3
R S232-2
Serial port 2 -RS232
interface
Standard DB9 female, 2 -TXD , 3 -RXD , 5-
GND
4
R S232-1
Serial port 1 -RS232
interface
Standard DB9 female, 2 -TXD , 3 -RXD , 5-
GND
5
RS422-1-R+
Serial port 1-RS422
interface-R+
3.81mm Phoenix terminal
6
RS422-1-R-
Serial port 1-RS422
interface-R-
3.81mm Phoenix terminal
7
GND
Serial port 1 ground
3.81mm Phoenix terminal
