Curtain and blind Motor RS485 Protocol Wiring Mode

RS485 control is one of the Low voltage control way, also is the wired control way. It requires a data cable to transmit the signal.

RS485 Protocol Wiring Mode:


1. Motors can automatically identify switch and RS485 Protocol appliance。

2. The “motor RJ11 data open and close switch interface application” and the “RS485 protocol application” cannot be used with the motor at the same time. ( It can not use by dry contact open and close application if already choose to use the RS485 Protocol to control the motor.)

3. The data level switch and the RS485 application cannot connect with the motor at the same time.
PS.: the lever switch means when the switch choose open or close, switch circuit will keep the same state. Only means the date switch. Wall Power switches still support connect with the motor.

Schematic Diagram

Curtain motor RS485 schematic diagram: It use the RS485 protocol command to control the motor open and close.

It use the RS485 protocol command to control the motor open and close.

Not using the dry contact open and close switch application.

RS485 Interface Function Defifinition

curtain motor RS485 connection port

Curtain motor RS485 and roller blind motor RS485 are the same logic.

② is 485A,③ is 485B.

Wiring mode diagram

RS485 Protocol Wiring Mode

The rs485 data cable connect with curtain motor and RS485 control box,

Then the motor connected in parallel to 485 transmission bus line, bus line can be added more, but bus line length not exceeding 100m.

Currtain’s smart curtain and blind motor RS485 Protocol

This is our company RS485 Protocol for curtain and blind motor, please kindly check it:

What is RS485?

RS-485, also known as TIA-485(-A) or EIA-485, is a widely used communication protocol and electrical standard for serial communication. It’s an extension of the RS-232 protocol but designed to overcome some of its limitations, especially for longer-distance communication and in noisy industrial environments.

Here are some key features and characteristics of the RS-485 protocol:

  1. Differential Signaling: RS-485 uses differential signaling, meaning it transmits data over two wires with opposite voltage levels. This makes it highly resistant to electrical noise and interference, making it suitable for industrial and long-distance communication.
  2. Half-Duplex or Full-Duplex: RS-485 supports both half-duplex and full-duplex communication modes. In half-duplex, devices take turns transmitting and receiving, while full-duplex allows simultaneous transmission and reception.
  3. Multiple Devices: RS-485 can support multiple devices (up to 32 in a standard configuration) on the same bus. Each device has a unique address, allowing the sender to specify which device should receive the data.
  4. Long Cable Length: One of the primary advantages of RS-485 is its ability to transmit data over long cable distances, often up to 1,200 meters (4,000 feet) or more, depending on the data rate and cable quality.
  5. Data Rates: RS-485 supports various data rates, ranging from a few hundred bits per second (bps) to several megabits per second (Mbps), depending on cable length and environmental conditions.
  6. Multi-Point and Multi-Drop: RS-485 can be configured in multi-point (devices connected in a daisy-chain) or multi-drop (devices branching off the main line) topologies.
  7. Common Ground: Unlike RS-232, which often requires separate ground wires, RS-485 devices typically share a common ground reference, simplifying wiring.
  8. Industrial Applications: RS-485 is commonly used in industrial automation, building automation, HVAC systems, instrumentation, and other applications where robust and noise-immune communication is essential.
  9. Modbus: The Modbus protocol, commonly used in industrial control systems, often utilizes RS-485 for communication.

Overall, RS-485 is a versatile and reliable protocol that remains popular in many industries due to its noise immunity, long-distance capabilities, and support for multiple devices on a single bus. It’s important to note that while RS-485 provides a robust physical layer, the choice of higher-layer protocols and data formats can vary depending on the specific application.

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Related Wiki

Curtain motor data cable control RJ12

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