CHAPTER 13 RS-485 COMMUNICATIONS
13
13.1 Modbus RTU Communications
13.1.1 Settings for Servo Amplifier
Set up the parameters of the servo amplifier (hereinafter called amplifier) to perform the Modbus
communications.
(1) Protocol selection
No.
Parameter name
Setting range
Default value Change
PA2_97 Communication
0: PC Loader protocol
0
Power
protocol selection 1: Modbus RTU
Set to 1 (Modbus RTU).
Since this parameter is set to 0 (PC Loader protocol) at factory shipment, be sure to change it to 1.
(2) Station number/communication baud rate
No.
Parameter name
Setting range
Default value Change
PA2_72 Station number
1 to 31
1
Power
PA2_73 Communication
baud rate
0･･･ 38400 [bps]
1･･･ 19200 [bps]
2･･･ 9600 [bps]
3･･･115200 [bps]
0
Power
Set an amplifier’s station number (slave’s station number) and a communication baud rate.
(3) Character configuration
No.
Parameter name
PA2_93 Selection of
parity/stop bit
Setting range
0: Even parity with 1 stop bit
1: Odd parity with 1 stop bit
2: No parity with 1 stop bit
3: Even parity with 2 stop bits
4: Odd parity with 2 stop bits
5: No parity with 2 stop bits
Default value Change
0
Power
13-2 Modbus RTU Communications