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7
Interface’s definition
Interface
Number
Function
Classification
Interface
Name
Default
Function
Extended
Function
Input
or
Output
Electrical
Characteristics
1
Online prompt
Online
Online prompt
pin(After DTU
connect data
center, this pin
output high
level+5v, after
disconnect data
center, this pin
input low
level-5v)
NO
output
Voltage output
range
：
-5V~+5V
2
RS232
RX
RS232 interface,
receive
pin(Assume
DTU connected
to computer ,the
date flow is:
DTU<-computer)
NO
input
Standard RS232
voltage
3
TX
RS232 interface,
send pin(Assume
DTU connected
to computer ,the
date flow is:
DTU->computer)
NO
output
Standard RS232
voltage
4
NC
NC
NO
5
GND
RS232
NO
GND
6
NC
无
7
Enable pin
SW
IO port power
switch(By
controlling this
pin controls the
power on and off
throughout the
DTU, when
connected -10v ~
0v voltage or let
the pin dangling
DTU power on)
power DTU, 3.3v
NO
input
SW function, input
voltage:-10v~30v
