Delta ASDA-A3 Series User Manual page 185

Wiring
Connecting multiple servo drives:
3
Note:
You can connect up to 32 axes through RS-485; CANopen cable length can be up to 30 m (98.43 ft).
1.
The communication quality and the number of 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 that you use a terminal resistor of 120 Ω (Ohm) and 0.5 W (or more).
2.
Connect multiple servo drives in parallel through the two ports of the CAN / RS-485 connector and put
3.
the terminal resistor in the last servo drive.
3-104
(1) Connect to the controller / PLC; (2) Modbus connector;
(3) Wiring for CAN / RS-485 terminal resistor
ASDA-A3