Communications D - 3
Communication Connection Terminal
Modbus communication uses the following terminals: S+, S-, R+, and R-. The terminating resistor must be turned ON only if
the Drive is at the very end of the serial communication chain. Set the terminating resistor by turning ON pin 1 of switch S1.
Fig D.2 Communication Connection Terminals and Terminating Resistor
Fig D.3 RS-485 Communication Connection
Procedure for Setting Up Communication
Use the following procedure to perform communication with the PLC.
1. Turn OFF the input to the Drive power and connect the communication cable between the PLC (or other master device)
and the Drive.
2. Turn ON the input power to the Drive.
3. Set the required communication parameters (H5-01 to H5-07) using the Digital Operator.
4. Turn OFF the input to the Drive power, and check that the Digital Operator display has completely extinguished.
5. Turn ON the input power to the Drive once again.
6. Perform communication with the master device.
IMPORTANT
1. Separate the communication cables from the main circuit cables and control circuit wiring.
2. Use shielded cables for the communication cable, and use proper shield clamps. Shield at one end only.
3. When using RS-485 communication, connect S+ to R+, and S- to R-, on the control circuit terminal
board. See Fig D.3 below.
Terminating resistor (1/2W, 110 Ohms)
RS-422A
or RS-485
Switch
S1
O
F
F
1
Terminating
resistor
DIP Switch S1 located on
terminal board.
2
1
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