AD-4405A Weighing Indicator
Page
67
17. RS-422/RS-485, Relay Output (OP-03)
Replacing the RS-232C interface with this option, the RS-422/RS-485 interface can
connect up to 32 indicators and control them from a computer or a PLC.
The functions of the RS-422/RS-485 interface are common to RS-232C except the
signal system.
The relays output the result of comparison.
Solid-state-relay
Maximum voltage
50VDC
Maximum current
100mA DC
Maximum resistance 8
Ω
Pin
connections
Function Pin No. Signal name
Direction
Description
1
SDA
Output
Transmission A terminal
2
SDB
Output
Transmission B terminal
3
RDA
Input
Receive A terminal
4
RDB
Input
Receive B terminal
5 TRM -
Terminator
resistor
(100
Ω
)
RS-422
RS-485
6 SG -
Signal
ground
7
HI
Output
Relay output HI
8
OK
Output
Relay output OK
9
LO
Output
Relay output LO
Relay
output
10
COM
-
Relay output common
Adaptable connector
TM-BLA10 (provided with the OP-03)
An AC adapter (provided with the OP-03) must be connected to the option board when using
the RS-422 or RS-485 interface. If using relay output only, the AC adapter is not required.
Circuit
17. RS-422/RS-485, Relay Output (OP-03)
HI
OK
LO
COM
HI
OK
LO
Relay Output Terminals
RS-422 Output
RS-485 Output
RS-422 Input
RS-485 Input
7
8
9
SDA SDB RDA RDB TRM
5V
47k
Ω
4.7k
Ω
47k
Ω
4.7k
Ω
100
Ω
RS-422/RS-485 Terminals
1
2
3
4
5
6
SG
10
DC
7 - 10V DC
AC adapter Jack
(The AC adapter is provided with the OP-03)
+
-
Note: Please confirm that the AC adapter type is correct
for your local voltage and receptacle type
