A&D Weighing AD-4406 - Manual (Page 55)

AD-4406 Weighing Indicator Page 53
Switching Between RS-422/RS-485
Switching between RS-422/RS-485 is made with the slide switch (S1) on the OP-03
board.
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
14. RS-422/485, 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-4406 #32
Address F06=32 AD-4406 #32
Address F06=32
AD-4406 #2
Address F06=2 AD-4406 #2
Address F06=2
AD-4406 #1
Address F06=1 AD-4406 #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.