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- Bi-directional Serial Conversion: Converts RS-232 signals to RS-422 or RS-485 and vice versa, enabling communication between legacy serial devices and modern industrial networks.
- Automatic Data Direction Control (ADDC): Built-in ADDC intelligence eliminates the need for manual baud rate or direction control settings, simplifying RS-485 half-duplex communication.
- High-Speed Data Transmission: Supports baud rates up to 921.6 Kbps without requiring switch configuration.
- Flexible Interface Options: Provides RJ45 and terminal block connectors for RS-422/485 connections, and RJ45 for RS-232.
- Comprehensive Signal Support: RS-232 signals include TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND; RS-422/485 signals include TxD±, RxD±, RTS±, CTS±, and GND.
- Protection and Reliability:
- TVS protection on all RS-422/485 lines (ESD 8 kV, EFT 2 kV).
- Overload protection for shorted signal pairs.
- Built-in 120 Ω termination resistor (jumper-selectable for RS-485).
- LED Indicators: Five LEDs (PWR, TxD, RxD, RTS, CTS) provide real-time status of power and signal activity.
- Compact and Durable Design: Small form factor (90 × 60 × 21 mm) with wall-mounting capability.
- Wide Power Input Range: Operates from +9 VDC to +30 VDC, supporting industrial 24 VDC systems.
- Multi-drop Capability: Supports up to 32 RS-485 devices over distances up to 1.2 km.
- Compliance: CE approved for industrial use.
- Automatic Data Direction Control (ADDC): Built-in ADDC intelligence eliminates the need for manual baud rate or direction control settings, simplifying RS-485 half-duplex communication.
- High-Speed Data Transmission: Supports baud rates up to 921.6 Kbps without requiring switch configuration.
- Flexible Interface Options: Provides RJ45 and terminal block connectors for RS-422/485 connections, and RJ45 for RS-232.
- Comprehensive Signal Support: RS-232 signals include TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND; RS-422/485 signals include TxD±, RxD±, RTS±, CTS±, and GND.
- Protection and Reliability:
- TVS protection on all RS-422/485 lines (ESD 8 kV, EFT 2 kV).
- Overload protection for shorted signal pairs.
- Built-in 120 Ω termination resistor (jumper-selectable for RS-485).
- LED Indicators: Five LEDs (PWR, TxD, RxD, RTS, CTS) provide real-time status of power and signal activity.
- Compact and Durable Design: Small form factor (90 × 60 × 21 mm) with wall-mounting capability.
- Wide Power Input Range: Operates from +9 VDC to +30 VDC, supporting industrial 24 VDC systems.
- Multi-drop Capability: Supports up to 32 RS-485 devices over distances up to 1.2 km.
- Compliance: CE approved for industrial use.
1. Product Overview
Product Name: Transio A52
Model: A52-230 (without power supply)
Series: Transio A52/53 Smart RS-232 to RS-422/485 Converter Series
Article Number: A52
Manufacturer: Moxa Technologies Co., Ltd.
Product Type: External RS-232 to RS-422/485 Bi-directional Converter (without power supply)
Part Number: 18020005210
Country of Manufacture: Taiwan
The Moxa Transio A52 is a compact, intelligent serial communication converter designed to bridge RS-232 interfaces with RS-422 or RS-485 networks. It provides a reliable, high-speed, and fully automatic data direction control mechanism for industrial and automation environments. The A52 model operates without an integrated power supply, requiring an external DC input between 9 and 30 VDC. It is engineered for robust performance in harsh industrial conditions, offering surge, ESD, and EFT protection for all communication lines.
2. Key Features
- Bi-directional Serial Conversion: Converts RS-232 signals to RS-422 or RS-485 and vice versa, enabling communication between legacy serial devices and modern industrial networks.
- Automatic Data Direction Control (ADDC): Built-in ADDC intelligence eliminates the need for manual baud rate or direction control settings, simplifying RS-485 half-duplex communication.
- High-Speed Data Transmission: Supports baud rates up to 921.6 Kbps without requiring switch configuration.
- Flexible Interface Options: Provides RJ45 and terminal block connectors for RS-422/485 connections, and RJ45 for RS-232.
- Comprehensive Signal Support: RS-232 signals include TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND; RS-422/485 signals include TxD±, RxD±, RTS±, CTS±, and GND.
- Protection and Reliability:
- TVS protection on all RS-422/485 lines (ESD 8 kV, EFT 2 kV).
- Overload protection for shorted signal pairs.
- Built-in 120 Ω termination resistor (jumper-selectable for RS-485).
- LED Indicators: Five LEDs (PWR, TxD, RxD, RTS, CTS) provide real-time status of power and signal activity.
- Compact and Durable Design: Small form factor (90 × 60 × 21 mm) with wall-mounting capability.
- Wide Power Input Range: Operates from +9 VDC to +30 VDC, supporting industrial 24 VDC systems.
- Multi-drop Capability: Supports up to 32 RS-485 devices over distances up to 1.2 km.
- Compliance: CE approved for industrial use.
3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Model | A52 |
| Manufacturer | Moxa Technologies Co., Ltd. |
| Interface Type | RS-232 to RS-422/485 bi-directional converter |
| RS-232 Connector | RJ45 |
| RS-422/485 Connector | RJ45 or Terminal Block |
| Baud Rate | Up to 921.6 Kbps |
| RS-232 Signals | TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND |
| RS-422 Signals | TxD+(B)/-(A), RxD+(B)/-(A), RTS+(B)/-(A), CTS+(B)/-(A), GND |
| RS-485 Signals | Data+(B)/-(A), GND |
| Protection | TVS protection (ESD 8 kV, EFT 2 kV) |
| Optical Isolation | None (A53 model only provides 2 kV isolation) |
| Termination Resistor | 120 Ω selectable via jumper (RS-485 mode) |
| Power Input | +9 VDC to +30 VDC |
| Power Consumption | 157 mA max @ +9 VDC |
| External Power Adapter (optional) | 9 VDC, 1.5 A UL/TUV 110/230 VAC adapter (supports up to 4 converters) |
| Operating Temperature | 0°C to 55°C |
| Dimensions (W × D × H) | 90 mm × 60 mm × 21 mm |
| Weight | Approx. 100 g (typical) |
| Mounting | Wall or surface mount (plastic plates and screws included) |
| Cable Length (RS-485) | Up to 1.2 km (multi-drop) |
| Device Support | Up to 32 RS-485 nodes |
| Certifications | CE approved |
| Enclosure Material | Industrial-grade plastic housing |
4. Functionality
The Transio A52 functions as a transparent, bi-directional converter between RS-232 and RS-422/485 interfaces. It enables communication between a host computer or controller equipped with an RS-232 port and remote devices using RS-422 or RS-485 serial standards.
Operating Modes:
- RS-422 Mode: Full-duplex communication supporting TxD±, RxD±, RTS±, and CTS± signals for hardware flow control.
- RS-485 Mode: Half-duplex communication supporting Data± lines. The converter automatically manages data direction using ADDC or can be manually controlled via RTS signal.
Automatic Data Direction Control (ADDC):
The ADDC mechanism detects data transmission from the RS-232 side and automatically switches the RS-485 transceiver direction, eliminating the need for software-based control or manual configuration.
Use Cases and Applications:
- Industrial automation and process control
- Factory equipment monitoring and data acquisition
- Building management and security systems
- Remote serial device control and telemetry
- SCADA and PLC communication networks
Compatibility:
The A52 is compatible with standard RS-232, RS-422, and RS-485 devices, including PLCs, HMIs, sensors, controllers, and industrial PCs. It supports both DTE and DCE configurations through RJ45-to-DB9 or RJ45-to-DB25 adapters.
5. Components & Accessories
Included Items:
- A52 converter unit
- Mounting kit (plastic plates and screws)
- User manual
Optional Accessories:
- External power adapter (9 VDC, 1.5 A UL/TUV 110/230 VAC)
- RJ45-to-DB9 or RJ45-to-DB25 serial cables (for DTE/DCE connection)
Connectors:
- RS-232 RJ45 Pinout:
1: DCD, 2: DTR, 3: CTS, 4: GND, 5: RxD, 6: TxD, 7: GND, 8: RTS, 9: DSR
- RS-422/485 RJ45 Pinout:
RS-485: 1: Data-(A), 5: Data+(B), 4/7: SG
RS-422: 1: TxD-(A), 5: TxD+(B), 6: RxD+(B), 10: RxD-(A), 2/3/8/9 for RTS/CTS pairs
- Terminal Block Pinout:
RS-485: 1: Data+(B), 2: Data-(A), 5: SG, 6: Power GND, 7: VCC (+9 V)
RS-422: 1: TxD+(B), 2: TxD-(A), 3: RxD+(B), 4: RxD-(A), 5: SG, 6: Power GND, 7: VCC (+9 V)
6. Installation & Setup
Mounting:
The A52 can be mounted on a wall or flat surface using the included plastic plates and screws. Ensure adequate ventilation and avoid exposure to excessive heat or vibration.
Power Connection:
- Connect an external DC power source (9–30 VDC) to the power jack or terminal block (Pin 6 = GND, Pin 7 = VCC).
- Do not confuse RS-422/485 signal ground (SG) with power ground (GND).
Mode Configuration:
- Remove the top cover by unscrewing two screws to access DIP switches and jumpers.
- SW1: RS-422 mode (OFF), RS-485 mode (ON, default).
- SW2: RTS control (OFF), ADDC automatic control (ON, default).
- Jumper: Enables/disables 120 Ω termination resistor in RS-485 mode.
LED Indicators:
- PWR: Power ON indicator (red).
- TxD: RS-232 transmit activity.
- RxD: RS-232 receive activity.
- RTS/CTS: Flow control signal indicators.
Typical Wiring:
- RS-232 to RS-422: Connect TxD/RxD and RTS/CTS pairs.
- RS-232 to RS-485: Connect Data+(B) and Data-(A) lines, with optional termination resistor enabled for end nodes.
7. Performance & Capabilities
- Transmission Speed: Up to 921.6 Kbps, supporting high-speed industrial communication.
- Distance: Up to 1.2 km (RS-485 multi-drop).
- Node Capacity: Supports up to 32 RS-485 devices on a single bus.
- Power Efficiency: Low power consumption (157 mA @ 9 VDC).
- Signal Integrity: Built-in TVS protection ensures stable operation under ESD and EFT conditions.
- Reliability: Overload protection prevents damage from shorted signal lines.
- Limitations:
- No optical isolation (available only on A53 model).
- Requires external power supply.
- Operating temperature limited to 0–55°C.
8. Standards & Compliance
- Certifications: CE approved for industrial and commercial use.
- Electrical Protection:
- ESD protection up to 8 kV (contact discharge).
- EFT protection up to 2 kV.
- TVS diodes on all RS-422/485 signal lines.
- Safety Compliance: Compatible with UL/TUV certified power adapters.
- Industry Standards:
- RS-232 (EIA/TIA-232)
- RS-422 (EIA/TIA-422)
- RS-485 (EIA/TIA-485)
9. Additional Information
Warranty:
Standard Moxa warranty applies (typically 3 years, depending on region and distributor).
Support & Documentation:
- User’s Manual: *Transio A52/53 User’s Manual* (Part No. 18020005210)
- Manufacturer Website: [www.moxa.com](https://www.moxa.com)
- Technical support includes configuration guidance, firmware updates, and troubleshooting assistance.
Maintenance:
- Periodically inspect connectors and cables for wear or corrosion.
- Ensure proper grounding and shielding in electrically noisy environments.
- Clean the enclosure with a dry, lint-free cloth; avoid solvents or liquids.
Firmware & Updates:
The A52 operates as a hardware-level converter and does not require firmware updates. Configuration is hardware-based via DIP switches and jumpers.
Service Life & Reliability:
Designed for continuous industrial operation with MTBF exceeding 100,000 hours under normal conditions.
### Summary
The Moxa Transio A52 is a robust, intelligent, and compact RS-232 to RS-422/485 converter engineered for industrial communication networks. It provides seamless, high-speed serial data conversion with automatic direction control, eliminating the need for manual configuration or software intervention. With its wide power input range, strong ESD/EFT protection, and flexible mounting and connection options, the A52 is ideal for factory automation, building management, and remote device control applications.
Its design emphasizes reliability, simplicity, and compatibility, making it a preferred choice for engineers integrating legacy RS-232 equipment into modern RS-422/485 infrastructures. The A52’s combination of performance, protection, and ease of use ensures dependable operation in demanding industrial environments.
Product Name: Transio A52
Model: A52-230 (without power supply)
Series: Transio A52/53 Smart RS-232 to RS-422/485 Converter Series
Article Number: A52
Manufacturer: Moxa Technologies Co., Ltd.
Product Type: External RS-232 to RS-422/485 Bi-directional Converter (without power supply)
Part Number: 18020005210
Country of Manufacture: Taiwan
The Moxa Transio A52 is a compact, intelligent serial communication converter designed to bridge RS-232 interfaces with RS-422 or RS-485 networks. It provides a reliable, high-speed, and fully automatic data direction control mechanism for industrial and automation environments. The A52 model operates without an integrated power supply, requiring an external DC input between 9 and 30 VDC. It is engineered for robust performance in harsh industrial conditions, offering surge, ESD, and EFT protection for all communication lines.
2. Key Features
- Bi-directional Serial Conversion: Converts RS-232 signals to RS-422 or RS-485 and vice versa, enabling communication between legacy serial devices and modern industrial networks.
- Automatic Data Direction Control (ADDC): Built-in ADDC intelligence eliminates the need for manual baud rate or direction control settings, simplifying RS-485 half-duplex communication.
- High-Speed Data Transmission: Supports baud rates up to 921.6 Kbps without requiring switch configuration.
- Flexible Interface Options: Provides RJ45 and terminal block connectors for RS-422/485 connections, and RJ45 for RS-232.
- Comprehensive Signal Support: RS-232 signals include TxD, RxD, RTS, CTS, DTR, DSR, DCD, and GND; RS-422/485 signals include TxD±, RxD±, RTS±, CTS±, and GND.
- Protection and Reliability:
- TVS protection on all RS-422/485 lines (ESD 8 kV, EFT 2 kV).
- Overload protection for shorted signal pairs.
- Built-in 120 Ω termination resistor (jumper-selectable for RS-485).
- LED Indicators: Five LEDs (PWR, TxD, RxD, RTS, CTS) provide real-time status of power and signal activity.
- Compact and Durable Design: Small form factor (90 × 60 × 21 mm) with wall-mounting capability.
- Wide Power Input Range: Operates from +9 VDC to +30 VDC, supporting industrial 24 VDC systems.
- Multi-drop Capability: Supports up to 32 RS-485 devices over distances up to 1.2 km.
- Compliance: CE approved for industrial use.
3. Technical Specifications
| Parameter | Specification |
|----------------|-------------------|
| Model | A52 |
| Manufacturer | Moxa Technologies Co., Ltd. |
| Interface Type | RS-232 to RS-422/485 bi-directional converter |
| RS-232 Connector | RJ45 |
| RS-422/485 Connector | RJ45 or Terminal Block |
| Baud Rate | Up to 921.6 Kbps |
| RS-232 Signals | TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND |
| RS-422 Signals | TxD+(B)/-(A), RxD+(B)/-(A), RTS+(B)/-(A), CTS+(B)/-(A), GND |
| RS-485 Signals | Data+(B)/-(A), GND |
| Protection | TVS protection (ESD 8 kV, EFT 2 kV) |
| Optical Isolation | None (A53 model only provides 2 kV isolation) |
| Termination Resistor | 120 Ω selectable via jumper (RS-485 mode) |
| Power Input | +9 VDC to +30 VDC |
| Power Consumption | 157 mA max @ +9 VDC |
| External Power Adapter (optional) | 9 VDC, 1.5 A UL/TUV 110/230 VAC adapter (supports up to 4 converters) |
| Operating Temperature | 0°C to 55°C |
| Dimensions (W × D × H) | 90 mm × 60 mm × 21 mm |
| Weight | Approx. 100 g (typical) |
| Mounting | Wall or surface mount (plastic plates and screws included) |
| Cable Length (RS-485) | Up to 1.2 km (multi-drop) |
| Device Support | Up to 32 RS-485 nodes |
| Certifications | CE approved |
| Enclosure Material | Industrial-grade plastic housing |
4. Functionality
The Transio A52 functions as a transparent, bi-directional converter between RS-232 and RS-422/485 interfaces. It enables communication between a host computer or controller equipped with an RS-232 port and remote devices using RS-422 or RS-485 serial standards.
Operating Modes:
- RS-422 Mode: Full-duplex communication supporting TxD±, RxD±, RTS±, and CTS± signals for hardware flow control.
- RS-485 Mode: Half-duplex communication supporting Data± lines. The converter automatically manages data direction using ADDC or can be manually controlled via RTS signal.
Automatic Data Direction Control (ADDC):
The ADDC mechanism detects data transmission from the RS-232 side and automatically switches the RS-485 transceiver direction, eliminating the need for software-based control or manual configuration.
Use Cases and Applications:
- Industrial automation and process control
- Factory equipment monitoring and data acquisition
- Building management and security systems
- Remote serial device control and telemetry
- SCADA and PLC communication networks
Compatibility:
The A52 is compatible with standard RS-232, RS-422, and RS-485 devices, including PLCs, HMIs, sensors, controllers, and industrial PCs. It supports both DTE and DCE configurations through RJ45-to-DB9 or RJ45-to-DB25 adapters.
5. Components & Accessories
Included Items:
- A52 converter unit
- Mounting kit (plastic plates and screws)
- User manual
Optional Accessories:
- External power adapter (9 VDC, 1.5 A UL/TUV 110/230 VAC)
- RJ45-to-DB9 or RJ45-to-DB25 serial cables (for DTE/DCE connection)
Connectors:
- RS-232 RJ45 Pinout:
1: DCD, 2: DTR, 3: CTS, 4: GND, 5: RxD, 6: TxD, 7: GND, 8: RTS, 9: DSR
- RS-422/485 RJ45 Pinout:
RS-485: 1: Data-(A), 5: Data+(B), 4/7: SG
RS-422: 1: TxD-(A), 5: TxD+(B), 6: RxD+(B), 10: RxD-(A), 2/3/8/9 for RTS/CTS pairs
- Terminal Block Pinout:
RS-485: 1: Data+(B), 2: Data-(A), 5: SG, 6: Power GND, 7: VCC (+9 V)
RS-422: 1: TxD+(B), 2: TxD-(A), 3: RxD+(B), 4: RxD-(A), 5: SG, 6: Power GND, 7: VCC (+9 V)
6. Installation & Setup
Mounting:
The A52 can be mounted on a wall or flat surface using the included plastic plates and screws. Ensure adequate ventilation and avoid exposure to excessive heat or vibration.
Power Connection:
- Connect an external DC power source (9–30 VDC) to the power jack or terminal block (Pin 6 = GND, Pin 7 = VCC).
- Do not confuse RS-422/485 signal ground (SG) with power ground (GND).
Mode Configuration:
- Remove the top cover by unscrewing two screws to access DIP switches and jumpers.
- SW1: RS-422 mode (OFF), RS-485 mode (ON, default).
- SW2: RTS control (OFF), ADDC automatic control (ON, default).
- Jumper: Enables/disables 120 Ω termination resistor in RS-485 mode.
LED Indicators:
- PWR: Power ON indicator (red).
- TxD: RS-232 transmit activity.
- RxD: RS-232 receive activity.
- RTS/CTS: Flow control signal indicators.
Typical Wiring:
- RS-232 to RS-422: Connect TxD/RxD and RTS/CTS pairs.
- RS-232 to RS-485: Connect Data+(B) and Data-(A) lines, with optional termination resistor enabled for end nodes.
7. Performance & Capabilities
- Transmission Speed: Up to 921.6 Kbps, supporting high-speed industrial communication.
- Distance: Up to 1.2 km (RS-485 multi-drop).
- Node Capacity: Supports up to 32 RS-485 devices on a single bus.
- Power Efficiency: Low power consumption (157 mA @ 9 VDC).
- Signal Integrity: Built-in TVS protection ensures stable operation under ESD and EFT conditions.
- Reliability: Overload protection prevents damage from shorted signal lines.
- Limitations:
- No optical isolation (available only on A53 model).
- Requires external power supply.
- Operating temperature limited to 0–55°C.
8. Standards & Compliance
- Certifications: CE approved for industrial and commercial use.
- Electrical Protection:
- ESD protection up to 8 kV (contact discharge).
- EFT protection up to 2 kV.
- TVS diodes on all RS-422/485 signal lines.
- Safety Compliance: Compatible with UL/TUV certified power adapters.
- Industry Standards:
- RS-232 (EIA/TIA-232)
- RS-422 (EIA/TIA-422)
- RS-485 (EIA/TIA-485)
9. Additional Information
Warranty:
Standard Moxa warranty applies (typically 3 years, depending on region and distributor).
Support & Documentation:
- User’s Manual: *Transio A52/53 User’s Manual* (Part No. 18020005210)
- Manufacturer Website: [www.moxa.com](https://www.moxa.com)
- Technical support includes configuration guidance, firmware updates, and troubleshooting assistance.
Maintenance:
- Periodically inspect connectors and cables for wear or corrosion.
- Ensure proper grounding and shielding in electrically noisy environments.
- Clean the enclosure with a dry, lint-free cloth; avoid solvents or liquids.
Firmware & Updates:
The A52 operates as a hardware-level converter and does not require firmware updates. Configuration is hardware-based via DIP switches and jumpers.
Service Life & Reliability:
Designed for continuous industrial operation with MTBF exceeding 100,000 hours under normal conditions.
### Summary
The Moxa Transio A52 is a robust, intelligent, and compact RS-232 to RS-422/485 converter engineered for industrial communication networks. It provides seamless, high-speed serial data conversion with automatic direction control, eliminating the need for manual configuration or software intervention. With its wide power input range, strong ESD/EFT protection, and flexible mounting and connection options, the A52 is ideal for factory automation, building management, and remote device control applications.
Its design emphasizes reliability, simplicity, and compatibility, making it a preferred choice for engineers integrating legacy RS-232 equipment into modern RS-422/485 infrastructures. The A52’s combination of performance, protection, and ease of use ensures dependable operation in demanding industrial environments.
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