A&D Weighing HW-1200KGV3 - Manual (Page 71)

HV-G/HW-G Series Page 69
17. Options
Circuits
Caution
Please confirm that the AC adapter type is correct for your local voltage and
receptacle type.
Selection switch for the RS-422/ RS-485 interface
Selects either of RS-422 or RS-485 interface using the switch on the board.
Installing OP-04
Step 1 Remove two screws that attach the
RS-232C board on rear of display
unit. Remove the RS-232C board.
Step 2 Switch the connections.
Step 3 Insert the board into the display
unit and affix with the screws.
5V
1 2 3 4 5 6 7 8 9
SDA SDB RDA RDB TRM HI OK LO COM DC
Relay output RS-422/485 terminal
AC adapter jack
RS-422 output
RS-485 output
RS-422 input
RS-485 input
120 Ω
47k Ω
OK
HI
LO
4.7k Ω
4.7k Ω
47k Ω
Relay