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Power and Wiring

Computer USB ── USB adapter ── TTL/RS485 bus ── servo
                              │                 │
                              └── ground ───────┤
External regulated supply (+/-) ────────────────┘

USB carries communication; an external supply powers the actuator. Always use the adapter and servo manuals for pin order—wire colors alone are not a specification.

Power

  • Stay inside the exact model's voltage range.
  • Budget current for simultaneous peak loads with margin.
  • Thin/long wiring and poor connectors cause voltage drop, resets and packet errors.
  • Group power for larger systems, add appropriate local decoupling and maintain a reliable common reference.
  • Disconnect power before inserting or rewiring devices.

Bus rules

  • IDs must be unique and baud rates equal on one bus.
  • Match TTL devices to TTL hardware and RS485 devices to RS485 hardware.
  • Avoid long star branches and loose connectors; engineer RS485 termination for link length and baud rate.
Check Confirm
Model Full suffix matches the label
Voltage Supply matches the exact datasheet
Pins V+, GND and signal/A/B are correct
Interface TTL-to-TTL or RS485-to-RS485
Mechanics Shaft can move without collision or pinch risk
Bus Only one new servo for the first test