Delta ASDA-A3 Series User Manual page 97

Wiring
Connecting multiple servo drives:
3
(1) Connect to the controller / PLC (2) Modbus connector (3) Wiring for CAN / RS-485 terminal resistor
Note:
This supports up to 32 axes via RS-485 with the CANopen cable length up to 30 m (98.43 ft).
1.
The communication quality and the connectable axes are determined by the controller's specifications,
quality of wires, grounding, interference, and whether a shielded twisted-pair cable is used.
It is suggested to use a terminal resistor of 120Ω (Ohm) and 0.5 W (or more).
2.
To connect multiple servo drives in parallel, use CAN / RS-485 connectors as shown above, and put
3.
the terminal resistor in the last servo drive.
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ASDA-A3