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- Bidirectional Conversion: Converts unbalanced RS‑232 signals to balanced RS‑422/RS‑485 signals and vice versa.
- High Data Rate: Supports transmission speeds up to 921.6 kbps over short distances (≤ 500 ft / 0.15 km).
- Long‑Distance Communication: Operates up to 4000 ft (1.2 km) at 115.2 kbps.
- Selectable Communication Modes:
- 4‑wire full‑duplex (RS‑422 or RS‑485)
- 2‑wire half‑duplex (RS‑485)
- Point‑to‑point, multidrop, simplex, and self‑test configurations supported.
- RTS Control: Transmit driver can be controlled automatically or via RTS signal.
- LED Indicators: Visual status indicators for TxD, RxD, RTS, and Power.
- Flexible Power Input: Operates from 9 – 30 V DC, 150 mA, via external adapter or terminal block pins.
- Compact and Lightweight: 90 × 60 × 21 mm, 76 g.
- Industrial‑Grade Design: Rugged enclosure with internal configuration switches protected from accidental changes.
- Mounting Options: Includes wall/surface mounting kit with plastic plates and screws.
- Protection Features: Built‑in resistor to prevent over‑current between remote and local grounds.
- Compatibility: Supports standard RS‑232 control signals (TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND).
- High Data Rate: Supports transmission speeds up to 921.6 kbps over short distances (≤ 500 ft / 0.15 km).
- Long‑Distance Communication: Operates up to 4000 ft (1.2 km) at 115.2 kbps.
- Selectable Communication Modes:
- 4‑wire full‑duplex (RS‑422 or RS‑485)
- 2‑wire half‑duplex (RS‑485)
- Point‑to‑point, multidrop, simplex, and self‑test configurations supported.
- RTS Control: Transmit driver can be controlled automatically or via RTS signal.
- LED Indicators: Visual status indicators for TxD, RxD, RTS, and Power.
- Flexible Power Input: Operates from 9 – 30 V DC, 150 mA, via external adapter or terminal block pins.
- Compact and Lightweight: 90 × 60 × 21 mm, 76 g.
- Industrial‑Grade Design: Rugged enclosure with internal configuration switches protected from accidental changes.
- Mounting Options: Includes wall/surface mounting kit with plastic plates and screws.
- Protection Features: Built‑in resistor to prevent over‑current between remote and local grounds.
- Compatibility: Supports standard RS‑232 control signals (TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND).
Comprehensive Product Summary – MOXA A50 RS‑232 to RS‑422/RS‑485 External Converter
### 1. Product Overview
Product Name: MOXA RS‑232 to RS‑422/RS‑485 Bidirectional Converter
Model: A50
Series: A50/A51/A60 Industrial Communication Converters
Article Number: A50
Manufacturer: Moxa Technologies Co., Ltd.
Edition: 2nd Edition, December 1999
The MOXA A50 is a compact, external, bidirectional signal converter designed to interface RS‑232 serial communication with RS‑422 or RS‑485 differential signaling systems. It enables reliable long‑distance and multi‑drop serial communication in industrial and automation environments. The A50 is part of Moxa’s A‑series converters, which also includes the A51 (with isolation protection) and the A60 (RS‑232 surge protection module).
### 2. Key Features
- Bidirectional Conversion: Converts unbalanced RS‑232 signals to balanced RS‑422/RS‑485 signals and vice versa.
- High Data Rate: Supports transmission speeds up to 921.6 kbps over short distances (≤ 500 ft / 0.15 km).
- Long‑Distance Communication: Operates up to 4000 ft (1.2 km) at 115.2 kbps.
- Selectable Communication Modes:
- 4‑wire full‑duplex (RS‑422 or RS‑485)
- 2‑wire half‑duplex (RS‑485)
- Point‑to‑point, multidrop, simplex, and self‑test configurations supported.
- RTS Control: Transmit driver can be controlled automatically or via RTS signal.
- LED Indicators: Visual status indicators for TxD, RxD, RTS, and Power.
- Flexible Power Input: Operates from 9 – 30 V DC, 150 mA, via external adapter or terminal block pins.
- Compact and Lightweight: 90 × 60 × 21 mm, 76 g.
- Industrial‑Grade Design: Rugged enclosure with internal configuration switches protected from accidental changes.
- Mounting Options: Includes wall/surface mounting kit with plastic plates and screws.
- Protection Features: Built‑in resistor to prevent over‑current between remote and local grounds.
- Compatibility: Supports standard RS‑232 control signals (TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND).
### 3. Technical Specifications
| Parameter | Specification |
|----------------|------------------|
| Power Supply | DC +9 V – +30 V, 150 mA |
| Data Rate | Up to 921,600 bps (≤ 500 ft); up to 115,200 bps (≤ 4000 ft) |
| Communication Distance | 1.2 km (4000 ft) at 115.2 kbps |
| RS‑232 Interface | RJ‑45 connector supporting TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND |
| RS‑422/RS‑485 Interface | RJ‑45 and 6‑pin terminal block connectors supporting TxDA, TxDB, RxDA, RxDB, GND |
| Switches | SW1: Duplex mode (Full/Half); SW2: Tx/Rx enable control |
| LED Indicators | TxD (green/orange), RxD (red/orange), RTS (red/green), Power (red) |
| Isolation Protection | None (A51 model provides 2000 V isolation) |
| Termination Resistor | RT1 space reserved for receiver termination (100 Ω typical for AWG #26 cable) |
| Mounting | Wall/surface mount via included kit |
| Dimensions | 90 mm × 60 mm × 21 mm |
| Weight | 76 g |
| Operating Temperature | Standard ambient industrial range (not specified; typical 0–55 °C) |
| Material | Industrial plastic housing with internal PCB and connectors |
### 4. Functionality
The A50 functions as a bidirectional signal converter between RS‑232 and RS‑422/RS‑485 interfaces. It translates voltage levels and signal formats, enabling communication between devices using different serial standards.
Operating Modes:
1. Point‑to‑Point (Full or Half Duplex): Direct connection between two devices.
2. Multidrop (Full or Half Duplex): One master and multiple slaves (up to 10 for RS‑422, 32 for RS‑485).
3. Simplex: One‑way communication (transmit‑only or receive‑only).
4. Self‑Test: Internal loopback for diagnostic verification.
Applications:
- Industrial automation and process control
- Remote data acquisition systems
- Building management and environmental monitoring
- SCADA and PLC communication
- Serial device networking and extension
Compatibility:
- Works with PCs, PLCs, HMIs, modems, and other RS‑232/RS‑422/RS‑485 devices.
- Supports both DTE (Data Terminal Equipment) and DCE (Data Communication Equipment) configurations.
- Compatible with standard RJ‑45 and DB‑9/DB‑25 serial wiring via adapter cables.
### 5. Components & Accessories
Included Items:
- MOXA A50 RS‑232 to RS‑422/RS‑485 converter
- Power adapter (9–30 V DC)
- Mounting kit (plastic plates and screws)
- A50/A51/A60 User’s Manual
Connectors:
- RS‑232 Port: RJ‑45 connector
- RS‑422/RS‑485 Port: RJ‑45 and 6‑pin terminal block
- Power Input: Barrel jack or terminal block pins 6 (Power GND) and 7 (Power Input)
Optional Accessories:
- DB‑9 or DB‑25 to RJ‑45 serial cables
- Additional termination resistors (RT1 position)
- DIN‑rail or panel mounting hardware (user‑supplied)
### 6. Installation & Setup
Installation Procedure:
1. Identify RS‑232 and RS‑422/RS‑485 ports labeled on the converter.
2. Prepare appropriate cables according to Appendix A wiring diagrams.
3. If mode changes are required, remove the two top screws and open the cover to access internal switches.
4. Configure SW1 for duplex mode and SW2 for Tx/Rx control.
5. Connect power via adapter or terminal block.
6. Observe LED indicators to verify power and signal activity.
Switch Configuration:
| Switch | Function | Setting | Description |
|-------------|--------------|--------------|----------------|
| SW1 | Duplex Mode | OFF = Full‑Duplex; ON = Half‑Duplex | Selects 4‑wire or 2‑wire operation |
| SW2 (TxD) | Transmit Driver Control | ON/OFF combinations | Always enabled, disabled, or RTS‑controlled |
| SW2 (RxD) | Receiver Control | ON/OFF combinations | Always enabled or /RTS‑controlled |
LED Indicators:
- TxD: Green = idle; Orange = transmitting
- RxD: Red = idle; Orange = receiving
- RTS: Red = RTS ON; Green = RTS OFF
- PWR: Red = power ON
Pin Assignments:
*RS‑422/RS‑485 Terminal Block:*
| Pin | Signal | Description |
|------|---------|-------------|
| 1 | TxD B | Transmit Data B |
| 2 | TxD A | Transmit Data A |
| 3 | RxD B | Receive Data B |
| 4 | RxD A | Receive Data A |
| 5 | GND | Signal Ground |
| 6 | Power GND | Power Ground |
| 7 | Power Input | 9–30 V DC Input |
*RS‑232 RJ‑45 Connector:*
| Pin | Signal | Description |
|------|---------|-------------|
| 1 | DCD | Data Carrier Detect |
| 2 | DSR | Data Set Ready |
| 3 | RTS | Request to Send |
| 4 | GND | Ground |
| 5 | TxD | Transmit Data |
| 6 | RxD | Receive Data |
| 7 | GND | Ground |
| 8 | CTS | Clear to Send |
| 9 | DTR | Data Terminal Ready |
| 10 | — | Not connected |
Wiring Notes:
- In half‑duplex mode, TxD A/B and RxD A/B are internally shorted.
- Do not confuse RS‑422/485 GND with Power GND.
- For improved signal integrity, connect grounds between devices.
### 7. Performance & Capabilities
- Speed: Up to 921.6 kbps (short range), 115.2 kbps (long range).
- Capacity: Supports up to 10 nodes (RS‑422) or 32 nodes (RS‑485) in multidrop mode.
- Efficiency: Differential signaling minimizes noise and allows long‑distance communication.
- Signal Integrity: Optional termination resistor (RT1) mitigates reflection and distortion.
- Reliability: LED diagnostics and self‑test mode simplify troubleshooting.
- Limitations:
- No galvanic isolation (use A51 for 2000 V isolation).
- Requires external DC power source.
- Environmental specifications not rated for extreme conditions.
### 8. Standards & Compliance
- Interface Standards:
- RS‑232 (EIA/TIA‑232‑E)
- RS‑422 (EIA/TIA‑422‑B)
- RS‑485 (EIA/TIA‑485‑A)
- Electrical Safety: Internal resistor protection against ground current.
- Isolation: None (A51 provides 2000 V isolation).
- Termination: RT1 position for impedance matching (100 Ω – 600 Ω typical).
- Regulatory Compliance: Designed in accordance with industrial communication standards; Moxa quality assurance applies.
- Environmental Compliance: RoHS and CE compliance assumed for later production (not specified in 1999 edition).
### 9. Additional Information
Warranty & Support:
- Standard Moxa limited warranty (duration varies by region).
- Technical support available via:
- Email: support@moxa.com.tw
- FTP: ftp.moxa.com / ftp.moxa.com.tw (User ID: ftp; Password: your email address)
- Web: www.moxa.com / www.moxa.com.tw
Maintenance:
- Periodically inspect connectors and cables for wear or oxidation.
- Verify switch settings after servicing.
- Use proper grounding to prevent electrical interference.
Firmware & Updates:
- No firmware required; hardware‑based converter.
- Updated manuals and drivers available through Moxa’s online services.
Troubleshooting Highlights:
- No Data Transmission: Check power, cable wiring, and switch settings.
- Data Errors: Verify baud rate and data format consistency.
- Self‑Test: Loopback TxD/RxD lines to confirm converter operation.
Related Models:
- A51: Same as A50 but with 2000 V isolation protection.
- A60: RS‑232 surge protection converter (2000 V transient suppression).
### Summary
The Moxa A50 RS‑232 to RS‑422/RS‑485 Converter is a robust, industrial‑grade communication interface device engineered for reliable serial data conversion across long distances and noisy environments. Its flexible configuration options, high‑speed capability, and comprehensive LED diagnostics make it ideal for system integrators and engineers deploying serial networks in automation, control, and monitoring applications. The A50’s compact form factor, wide power range, and support for both RJ‑45 and terminal block connections ensure easy integration into existing systems. For applications requiring electrical isolation or surge protection, the A51 and A60 models provide complementary functionality within the same product family.
### 1. Product Overview
Product Name: MOXA RS‑232 to RS‑422/RS‑485 Bidirectional Converter
Model: A50
Series: A50/A51/A60 Industrial Communication Converters
Article Number: A50
Manufacturer: Moxa Technologies Co., Ltd.
Edition: 2nd Edition, December 1999
The MOXA A50 is a compact, external, bidirectional signal converter designed to interface RS‑232 serial communication with RS‑422 or RS‑485 differential signaling systems. It enables reliable long‑distance and multi‑drop serial communication in industrial and automation environments. The A50 is part of Moxa’s A‑series converters, which also includes the A51 (with isolation protection) and the A60 (RS‑232 surge protection module).
### 2. Key Features
- Bidirectional Conversion: Converts unbalanced RS‑232 signals to balanced RS‑422/RS‑485 signals and vice versa.
- High Data Rate: Supports transmission speeds up to 921.6 kbps over short distances (≤ 500 ft / 0.15 km).
- Long‑Distance Communication: Operates up to 4000 ft (1.2 km) at 115.2 kbps.
- Selectable Communication Modes:
- 4‑wire full‑duplex (RS‑422 or RS‑485)
- 2‑wire half‑duplex (RS‑485)
- Point‑to‑point, multidrop, simplex, and self‑test configurations supported.
- RTS Control: Transmit driver can be controlled automatically or via RTS signal.
- LED Indicators: Visual status indicators for TxD, RxD, RTS, and Power.
- Flexible Power Input: Operates from 9 – 30 V DC, 150 mA, via external adapter or terminal block pins.
- Compact and Lightweight: 90 × 60 × 21 mm, 76 g.
- Industrial‑Grade Design: Rugged enclosure with internal configuration switches protected from accidental changes.
- Mounting Options: Includes wall/surface mounting kit with plastic plates and screws.
- Protection Features: Built‑in resistor to prevent over‑current between remote and local grounds.
- Compatibility: Supports standard RS‑232 control signals (TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND).
### 3. Technical Specifications
| Parameter | Specification |
|----------------|------------------|
| Power Supply | DC +9 V – +30 V, 150 mA |
| Data Rate | Up to 921,600 bps (≤ 500 ft); up to 115,200 bps (≤ 4000 ft) |
| Communication Distance | 1.2 km (4000 ft) at 115.2 kbps |
| RS‑232 Interface | RJ‑45 connector supporting TxD, RxD, DTR, DSR, RTS, CTS, DCD, GND |
| RS‑422/RS‑485 Interface | RJ‑45 and 6‑pin terminal block connectors supporting TxDA, TxDB, RxDA, RxDB, GND |
| Switches | SW1: Duplex mode (Full/Half); SW2: Tx/Rx enable control |
| LED Indicators | TxD (green/orange), RxD (red/orange), RTS (red/green), Power (red) |
| Isolation Protection | None (A51 model provides 2000 V isolation) |
| Termination Resistor | RT1 space reserved for receiver termination (100 Ω typical for AWG #26 cable) |
| Mounting | Wall/surface mount via included kit |
| Dimensions | 90 mm × 60 mm × 21 mm |
| Weight | 76 g |
| Operating Temperature | Standard ambient industrial range (not specified; typical 0–55 °C) |
| Material | Industrial plastic housing with internal PCB and connectors |
### 4. Functionality
The A50 functions as a bidirectional signal converter between RS‑232 and RS‑422/RS‑485 interfaces. It translates voltage levels and signal formats, enabling communication between devices using different serial standards.
Operating Modes:
1. Point‑to‑Point (Full or Half Duplex): Direct connection between two devices.
2. Multidrop (Full or Half Duplex): One master and multiple slaves (up to 10 for RS‑422, 32 for RS‑485).
3. Simplex: One‑way communication (transmit‑only or receive‑only).
4. Self‑Test: Internal loopback for diagnostic verification.
Applications:
- Industrial automation and process control
- Remote data acquisition systems
- Building management and environmental monitoring
- SCADA and PLC communication
- Serial device networking and extension
Compatibility:
- Works with PCs, PLCs, HMIs, modems, and other RS‑232/RS‑422/RS‑485 devices.
- Supports both DTE (Data Terminal Equipment) and DCE (Data Communication Equipment) configurations.
- Compatible with standard RJ‑45 and DB‑9/DB‑25 serial wiring via adapter cables.
### 5. Components & Accessories
Included Items:
- MOXA A50 RS‑232 to RS‑422/RS‑485 converter
- Power adapter (9–30 V DC)
- Mounting kit (plastic plates and screws)
- A50/A51/A60 User’s Manual
Connectors:
- RS‑232 Port: RJ‑45 connector
- RS‑422/RS‑485 Port: RJ‑45 and 6‑pin terminal block
- Power Input: Barrel jack or terminal block pins 6 (Power GND) and 7 (Power Input)
Optional Accessories:
- DB‑9 or DB‑25 to RJ‑45 serial cables
- Additional termination resistors (RT1 position)
- DIN‑rail or panel mounting hardware (user‑supplied)
### 6. Installation & Setup
Installation Procedure:
1. Identify RS‑232 and RS‑422/RS‑485 ports labeled on the converter.
2. Prepare appropriate cables according to Appendix A wiring diagrams.
3. If mode changes are required, remove the two top screws and open the cover to access internal switches.
4. Configure SW1 for duplex mode and SW2 for Tx/Rx control.
5. Connect power via adapter or terminal block.
6. Observe LED indicators to verify power and signal activity.
Switch Configuration:
| Switch | Function | Setting | Description |
|-------------|--------------|--------------|----------------|
| SW1 | Duplex Mode | OFF = Full‑Duplex; ON = Half‑Duplex | Selects 4‑wire or 2‑wire operation |
| SW2 (TxD) | Transmit Driver Control | ON/OFF combinations | Always enabled, disabled, or RTS‑controlled |
| SW2 (RxD) | Receiver Control | ON/OFF combinations | Always enabled or /RTS‑controlled |
LED Indicators:
- TxD: Green = idle; Orange = transmitting
- RxD: Red = idle; Orange = receiving
- RTS: Red = RTS ON; Green = RTS OFF
- PWR: Red = power ON
Pin Assignments:
*RS‑422/RS‑485 Terminal Block:*
| Pin | Signal | Description |
|------|---------|-------------|
| 1 | TxD B | Transmit Data B |
| 2 | TxD A | Transmit Data A |
| 3 | RxD B | Receive Data B |
| 4 | RxD A | Receive Data A |
| 5 | GND | Signal Ground |
| 6 | Power GND | Power Ground |
| 7 | Power Input | 9–30 V DC Input |
*RS‑232 RJ‑45 Connector:*
| Pin | Signal | Description |
|------|---------|-------------|
| 1 | DCD | Data Carrier Detect |
| 2 | DSR | Data Set Ready |
| 3 | RTS | Request to Send |
| 4 | GND | Ground |
| 5 | TxD | Transmit Data |
| 6 | RxD | Receive Data |
| 7 | GND | Ground |
| 8 | CTS | Clear to Send |
| 9 | DTR | Data Terminal Ready |
| 10 | — | Not connected |
Wiring Notes:
- In half‑duplex mode, TxD A/B and RxD A/B are internally shorted.
- Do not confuse RS‑422/485 GND with Power GND.
- For improved signal integrity, connect grounds between devices.
### 7. Performance & Capabilities
- Speed: Up to 921.6 kbps (short range), 115.2 kbps (long range).
- Capacity: Supports up to 10 nodes (RS‑422) or 32 nodes (RS‑485) in multidrop mode.
- Efficiency: Differential signaling minimizes noise and allows long‑distance communication.
- Signal Integrity: Optional termination resistor (RT1) mitigates reflection and distortion.
- Reliability: LED diagnostics and self‑test mode simplify troubleshooting.
- Limitations:
- No galvanic isolation (use A51 for 2000 V isolation).
- Requires external DC power source.
- Environmental specifications not rated for extreme conditions.
### 8. Standards & Compliance
- Interface Standards:
- RS‑232 (EIA/TIA‑232‑E)
- RS‑422 (EIA/TIA‑422‑B)
- RS‑485 (EIA/TIA‑485‑A)
- Electrical Safety: Internal resistor protection against ground current.
- Isolation: None (A51 provides 2000 V isolation).
- Termination: RT1 position for impedance matching (100 Ω – 600 Ω typical).
- Regulatory Compliance: Designed in accordance with industrial communication standards; Moxa quality assurance applies.
- Environmental Compliance: RoHS and CE compliance assumed for later production (not specified in 1999 edition).
### 9. Additional Information
Warranty & Support:
- Standard Moxa limited warranty (duration varies by region).
- Technical support available via:
- Email: support@moxa.com.tw
- FTP: ftp.moxa.com / ftp.moxa.com.tw (User ID: ftp; Password: your email address)
- Web: www.moxa.com / www.moxa.com.tw
Maintenance:
- Periodically inspect connectors and cables for wear or oxidation.
- Verify switch settings after servicing.
- Use proper grounding to prevent electrical interference.
Firmware & Updates:
- No firmware required; hardware‑based converter.
- Updated manuals and drivers available through Moxa’s online services.
Troubleshooting Highlights:
- No Data Transmission: Check power, cable wiring, and switch settings.
- Data Errors: Verify baud rate and data format consistency.
- Self‑Test: Loopback TxD/RxD lines to confirm converter operation.
Related Models:
- A51: Same as A50 but with 2000 V isolation protection.
- A60: RS‑232 surge protection converter (2000 V transient suppression).
### Summary
The Moxa A50 RS‑232 to RS‑422/RS‑485 Converter is a robust, industrial‑grade communication interface device engineered for reliable serial data conversion across long distances and noisy environments. Its flexible configuration options, high‑speed capability, and comprehensive LED diagnostics make it ideal for system integrators and engineers deploying serial networks in automation, control, and monitoring applications. The A50’s compact form factor, wide power range, and support for both RJ‑45 and terminal block connections ensure easy integration into existing systems. For applications requiring electrical isolation or surge protection, the A51 and A60 models provide complementary functionality within the same product family.
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A50_51_60.pdf
Manual
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