RS232 to RS485/RS422 Serial Converter – DB9 Female to Terminal Block
Connect RS232 serial equipment to RS485 or RS422 communication systems with this compact industrial serial interface converter. Designed for industrial automation, equipment integration, maintenance, and field service applications, this converter provides a convenient solution for connecting legacy RS232 devices to compatible RS485 and RS422 equipment.
Featuring a DB9 female RS232 connector and a four-position screw terminal block with clearly labeled connections, the converter supports flexible installation in control panels, equipment cabinets, and industrial communication systems.
The supplier specifies port-powered operation, automatic data direction control, and support for both 2-wire RS485 half-duplex and 4-wire RS422 full-duplex communication.
Key Features
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RS232 to RS485/RS422 Conversion: Connect compatible RS232 serial equipment to RS485 or RS422 communication interfaces.
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DB9 Female RS232 Connector: Standard 9-pin D-Sub female connection for compatible serial equipment.
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Clearly Labeled Terminal Connections: Four-position screw terminal block with screen-printed T+, T−, R+, and R− markings for convenient wiring identification.
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Port-Powered Operation: Designed to operate using power derived from RS232 signal lines without requiring an external power supply, according to supplier specifications.
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Automatic Data Direction Control: Supports automatic transmit/receive direction handling for compatible RS485 applications.
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Flexible Communication Modes: Supports 2-wire RS485 half-duplex and 4-wire RS422 full-duplex operation, as specified by the supplier.
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Selectable 120Ω Termination: Supplier specifies selectable termination for appropriate serial network configurations.
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Industrial Protection Features: Supplier specifies 600W surge protection and 15kV electrostatic discharge (ESD) protection.
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Extended Communication Distance: Supports distances up to 1.2 km (approximately 4,000 feet) under suitable installation conditions, according to supplier specifications.
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Compact Design: Convenient for industrial equipment integration, maintenance, and field applications.
Technical Specifications
| Specification | Details |
|---|---|
| Product Type | Active serial interface converter |
| Conversion | RS232 to RS485 / RS422 |
| RS232 Connection | DB9 female, 9-pin D-Sub |
| RS485/RS422 Connection | 4-position screw terminal block |
| Terminal Markings | T+, T−, R+, R− |
| RS485 Communication | 2-wire half-duplex, supplier specified |
| RS422 Communication | 4-wire full-duplex, supplier specified |
| Baud Rate | 300 bps to 115.2 Kbps, supplier specified |
| Power Requirement | RS232 port-powered, supplier specified |
| Direction Control | Automatic, supplier specified |
| Termination | Selectable 120Ω, supplier specified |
| Surge Protection | 600W, supplier specified |
| ESD Protection | 15kV, supplier specified |
| Operating Temperature | -40°C to +85°C, supplier specified |
| Maximum Communication Distance | Up to 1.2 km under suitable conditions, supplier specified |
| Housing | Compact black enclosure |
Terminal Connection Identification
The converter features four clearly marked screw terminals, arranged in the following order:
| Terminal | Marking | Function |
|---|---|---|
| 1 | T+ | Transmit positive |
| 2 | T− | Transmit negative |
| 3 | R+ | Receive positive |
| 4 | R− | Receive negative |
These markings simplify identification of the transmit and receive connections during installation.
Important: The correct wiring arrangement depends on the selected RS485 or RS422 operating mode and the connected equipment. Consult the manufacturer's instructions before wiring a 2-wire RS485 connection.
Typical Applications
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Industrial automation and machine control systems
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PLC and industrial controller communications
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RS232-to-RS485 equipment integration
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RS422 serial communication interfaces
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Industrial instrumentation and monitoring equipment
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Legacy serial equipment upgrades
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Factory maintenance and troubleshooting
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Industrial field service and equipment testing
Important Compatibility Information
This converter provides electrical interface conversion between compatible RS232 and RS485/RS422 serial devices. It does not convert USB or Ethernet signals and does not translate higher-level communication protocols.
Before installation, verify the RS232 DB9 pin configuration, RS485/RS422 communication mode, terminal wiring, termination requirements, and compatibility with the connected equipment.
Because the converter is specified as RS232 port-powered, operation depends on the available RS232 signal-line power and the connected equipment.
Actual communication distance and performance depend on cable quality, baud rate, electrical interference, grounding, termination, and installation conditions.
Technical Note: Performance ratings and protection specifications are based on supplier-provided information and have not been independently verified by Industrial Netware.
