A&D AD-4405 User Manual

AD-4405 Weighing Indicator

 Page 

67 

 

Switching Between RS

Switching Between RS

Switching Between RS

Switching Between RS-

-

-

-422/RS

422/RS

422/RS

422/RS-

-

-

-485

485

485

485

         

 

Switching between RS-422/RS-485 is made with the slide switch (S1) on the OP-03 

board.

 

 

Connection

Connection

Connection

Connection    

  The polarity of signals A and B may vary with different computers. 

  It is not necessary to ground the SG terminal when using a computer without a signal 

ground terminal. 

 

RS-422 RS-485 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17. RS-422/RS-485, Relay Output(OP-03)

RDA 
RDB 

SDA 

 

SDB 

SDA 
SDB 

RDA 
RDB 

 

TRM 

SDA 
SDB 

RDA 
RDB 

 

TRM 

SDA 
SDB 

RDA 
RDB 

 

TRM 

SDA 
SDB 

RDA 
RDB 

 

TRM 

SDA 
SDB 

RDA 
RDB 

 

TRM 

A 

 

B 

Some computers have
terminators inside. 

SDA 
SDB 

RDA 
RDB 

 

TRM 

AD-4405 #32 
Address F06=32

 

AD-4405 #32 
Address F06=32

 

AD-4405 #2 
Address F06=2

AD-4405 #2 
Address F06=2

 

AD-4405 #1 
Address F06=1

 

AD-4405 #1 
Address F06=1

Host computer

 

Host computer

Connect a terminator to the 
end connection. 
Internal termination resister 
is effective when the TRM 
terminal is connected to the 
RDB terminal.