Alpha ALPHA6000 Series Manual page 222

Appendix 4 MODBUS Communication
SW4
ON
2
1
OFF
RS-485
Switchs of terminal resistance
Note on Communication Wiring:
(1) Communication wires must be separated from the main circuit and other power
supply wires.
(2) Communication wires must be shielded cable and one terminal near the ac drive
the shielded layer must connect to the terminal GND of ac drive, the other terminal
should keep free to avoid disturber.
Sequence to Communication with PLC:
1. Cut off the power supply, Use Shielded Cable to connect RS485 terminal with PLC；
2. Power on the ac drive；
3. Use keyboard and set the communication parameters (P0.01, P0.02, P0.04, P7.00,
P7.01, Pb.00～Pb.07)；
4. Perform communication between PLC and the linked ac drive.
http://www.acdrive-china.com
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