2-4 Wire RS-422/RS-485 Converter (9-pin) with Auto Send Data Control - B+B SmartWorx

The 2-4 Wire 422/485 9 pin Converter from B+B SmartWorx is a compact, port-powered solution that bridges RS-232 devices to robust RS-422 and RS-485 networks. Designed for reliability in industrial environments, this converter transforms TD (transmit) and RD (receive) signals from RS-232 into the differential RS-422/RS-485 formats, enabling longer cable runs, multi-drop networks, and improved noise immunity. With Automatic Send Data Control (SDC) built in, the unit automatically enables the RS-485 driver whenever data appears on the RS-232 side, removing the need for external control signals and simplifying integration into existing equipment. This makes it an ideal choice for automation, process control, data acquisition, and serial device networks where simplicity and dependability matter most.

• Port-powered RS-232 to RS-422/RS-485 converter that draws power directly from the host serial port, eliminating the need for an external power supply.
• Supports both 2-wire and 4-wire RS-422/RS-485 configurations, enabling flexible topologies such as point-to-point, multidrop, and networked devices across varying distances.
• Automatic Send Data Control (SDC) automatically enables the RS-485 driver when data is present on the RS-232 side, reducing latency and removing manual direction-control requirements.
• 9-pin (DB9) port design and durable construction provide reliable performance in industrial settings while preserving compatibility with standard serial interfaces.
• Simple, plug-and-play operation with no external power dependency and straightforward topology integration for quick deployment in new or existing systems.

Technical Details of 2-4 Wire RS-422/RS-485 Converter (B+B SmartWorx)

• Type: Port-powered RS-232 to RS-422/RS-485 converter supporting 2-wire and 4-wire configurations
• Connector: 9-pin DB9 port on the RS-232 side for host interface; RS-422/RS-485 network connections suitable for differential signaling
• Power: Draws operating power from the RS-232 port (no external supply required)
• Direction control: Automatic Send Data Control (SDC) automates RS-485 driver enable/disable based on RS-232 activity
• Data compatibility: Converts TD and RD lines from RS-232 to differential RS-422/RS-485 signals for reliable long-distance communication
• Environment: Designed for durability in standard industrial environments and compatible with typical serial devices and controllers
• Brand and model lineage: B+B SmartWorx line of serial interface devices known for robust industrial communications

how to install 2-4 Wire 422/485 9 pin Converter

• Power is supplied by the host RS-232 port, so connect the converter to the DS carte or computer’s serial port using a standard RS-232 cable to the DB9 connector.
• Connect the RS-422/RS-485 network lines to the corresponding terminals or connectors provided on the converter according to your topology (2-wire or 4-wire as required by your device network).
• Ensure the RS-232 device is configured for the desired baud rate, data bits, parity, and stop bits that match the RS-422/RS-485 network requirements, since the converter passes through the RS-232 framing to the differential side.
• Power the host device and verify the link status. The Automatic Send Data Control will enable the RS-485 driver automatically when data is transmitted from the RS-232 side.
• Test the communication with a loopback or an end-to-end data transfer test to confirm successful data exchange across the RS-422/RS-485 network. If issues arise, check cabling, termination resistors, and network topology for compatibility.

Frequently asked questions

• What is the purpose of this converter? It bridges RS-232 devices to RS-422/RS-485 networks, enabling longer distance communication with improved noise immunity and the ability to support multi-drop networks.
• Do I need an external power supply? No. The unit is port-powered and draws its operating power directly from the RS-232 port.
• What is Automatic Send Data Control (SDC)? SDC is a feature that automatically enables the RS-485 driver when data appears on the RS-232 side, simplifying integration and eliminating manual driver control.
• Can I use 2-wire and 4-wire configurations? Yes. The converter supports both 2-wire and 4-wire RS-422/RS-485 configurations, providing flexibility for different network topologies.
• Is this compatible with standard Windows or Linux systems? Devices in the B+B SmartWorx family are designed for broad compatibility with common operating systems and serial interfaces. For specific driver requirements or compatibility, consult your host system documentation and the product manual.
• What kind of networks can I connect? You can connect point-to-point links or multidrop RS-422/RS-485 networks, depending on your topography and termination strategy. Ensure proper biasing and termination for reliable operation.
• What baud rates are supported? The converter operates at standard RS-232 baud rates and passes those rates to the RS-422/RS-485 side. Match the host and network settings to ensure reliable communication.