1. паview
The waveshare FT232RNL USB to RS232/485/422/TTL Interface Converter is an industrial-grade isolated converter designed for reliable and stable communication across various serial interfaces. It leverages an original FT232RNL chip for superior performance and compatibility. This device is engineered with multiple protection features to ensure safe and durable operation in diverse environments.

Figure 1: waveshare FT232RNL USB to RS232/485/422/TTL Interface Converter
2. Асаблівасці
- Original FT232RNL Chip: Ensures fast, stable, and reliable communication with enhanced compatibility.
- Multi-Interface Conversion: Supports USB to RS232, USB to RS485, USB to RS422, and USB to TTL.
- Unibody Power Supply Isolation: Забяспечвае стабільны ізаляваны аб'ёмtage without requiring external power for the isolated terminal.
- Unibody Digital Isolation: Allows signal isolation, offering high reliability, strong anti-interference, and low power consumption.
- TVS (Transient Voltage Suppressor): Эфектыўна падаўляе ўсплёск ціскуtagе і пераходны ўсплёск абtage, providing lightningproof and ESD protection.
- Self-Recovery Fuse & Protection Diodes: Ensures stable current/voltage outputs, offering over-current/over-voltage proof and improved shock resistance.
- Automatic Transceiver Circuit: Fully automatic, no-delay transceiver circuit for fast and stable communication without interference.
- TTL Serial 3.3V/5V Voltage Translator: Configurable TTL level via switch.
- Святлодыёдныя індыкатары: Three LEDs indicate power (PWR) and transceiver status (TXD, RXD).
- High-Quality Connectors: Durable USB-B and RS232 connectors for smooth plug/pull.
- Industrial-Grade Metal Case: Supports wall-mount and rail-mount installations, providing a solid and aesthetically pleasinдызайн g.

Figure 2: Internal Design and Protection Features
3. Змест пакета
У камплект прадукту звычайна ўваходзяць наступныя элементы:
- waveshare FT232RNL USB to RS232/485/422/TTL Interface Converter
- Кабель USB-A да USB-B
- Адвёртка
- Мантажныя кранштэйны (папярэдне ўсталяваныя або асобныя)

Малюнак 3: Змест пакета
4. Настройка
To set up your waveshare FT232RNL converter, follow these general steps:
- Падключэнне да хоста: Use the provided USB-A to USB-B cable to connect the converter's USB-B port to a USB port on your computer (PC, Mac, Linux, Android device).
- Ўстаноўка драйвера: For most modern operating systems (Windows, Linux, Mac, Android), the necessary drivers for the FT232RNL chip should install automatically upon connection. If not, drivers can be obtained from the FTDI website or waveshare's official support page.
- Select TTL Level (if applicable): If using the TTL interface, adjust the 3.3V/5V voltage translator switch on the converter to match the voltage level of your target device.
- Падключэнне паслядоўнай прылады: Connect your RS232, RS485, RS422, or TTL serial device to the corresponding screw terminals or DB9 connector on the converter. Ensure correct pin assignments (refer to Section 6: Interface Introduction).
- Праверце злучэнне: The PWR LED on the converter should illuminate when connected to a powered USB port. The TXD and RXD LEDs will flash during data transmission.
Video 1: Demonstrates the connection and various interface conversions of the waveshare USB to RS232/485/422/TTL converter.
5. Аперацыйная
Once the converter is set up and connected, it operates as a transparent bridge between your USB host and the connected serial device. The onboard automatic transceiver circuit manages data flow without manual intervention.
Святлодыёдныя індыкатары:
- PWR (Red): Indicates power. Lights up when the USB connection is established and voltagе выяўляецца.
- TXD (Green): Transmit Data Indicator. Lights up when the USB port sends data.
- RXD (Green): Receive Data Indicator. Lights up when the device ports send data back.
To communicate with your serial device, use appropriate serial communication software on your computer. Configure the software with the correct COM port (assigned by your operating system), baud rate, data bits, parity, and stop bits to match your serial device's settings.
6. Увядзенне інтэрфейсу
The converter provides multiple interfaces for versatile connectivity:

Малюнак 4: Закончанаview of Converter Interfaces
RS232 Pinout (DB9 Male):
| PIN-код | Апісанне |
|---|---|
| 2 | Receiving data (RXD) |
| 3 | Sending data (TXD) |
| 5 | Зямля GND |
| 1, 4, 6, 7, 8, 9 | N/C (Not Connected) |
RS485/RS422 Pinout (Screw Terminal):
| Screw Terminal (PIN) | Апісанне |
|---|---|
| PE | 485/422 signal ground |
| TA | RS422 send differential signal positive / RS485 differential signal positive A+ |
| TB | RS422 send differential signal negative / RS485 differential signal negative B- |
| RA | RS422 receive differential signal positive |
| RB | RS422 receive differential signal negative |
TTL (UART) Pinout (Screw Terminal):
| Screw Terminal (PIN) | Апісанне |
|---|---|
| TXD | TTL transmit data pin, connect to MCU.RXD |
| RXD | TTL receive data pin, connect to MCU.TXD |
| GND | Падключыцеся да GND |
| VCC | 5V / 3.3V power supply output, configurable via 5V/3.3V level switch |

Figure 5: Detailed Pinouts
7. Тэхнічныя характарыстыкі
| Катэгорыя | Спецыфікацыя |
|---|---|
| Тып прадукту | Industrial grade digital isolated converter |
| Аперацыйная Voltage | 5V (USB) / 3.3V / 5V (TTL) |
| Раз'ём USB | USB-B |
| Абарона USB | Засцерагальнік 200 мА з самааднаўленнем, ізаляваны выхад |
| Раз'ём RS232 | DB9 мужчына |
| Абарона RS232 | TVS diode, surge protection & ESD protection |
| RS232 Transmission Mode | Кропка-кропка |
| Хуткасць перадачы RS232 | 300 біт/с ~ 460 800 біт/с |
| Раз'ём RS485/422 | Вінтавая клема |
| RS485/422 Direction Control | Hardware automatic control |
| RS485/422 Protection | 600W lightningproof and surge-suppress, 15KV ESD protection (reserved two 120R balancing resistors, enabled/disabled via jumper) |
| RS485/422 Transmission Mode | Point-to-multipoints (485 mode: up to 32 nodes, repeaters recommended for 16+ nodes; 422 mode: up to 256 nodes, repeaters recommended for 16+ nodes) |
| RS485/422 Baud Rate | 300 біт/с ~ 2 Мбіт/с |
| TTL (UART) Connector | Вінтавая клема |
| TTL (UART) Pins | TXD, RXD, GND, 5V/3.3V |
| TTL (UART) Protection | Clamp ахоўны дыёд, перавыклtagэ/адм.-тtage доказ, ударатрываласць |
| TTL (UART) Transmission Mode | Кропка-кропка |
| TTL (UART) Baud Rate | 300 біт/с ~ 2 Мбіт/с |
| Працоўная тэмпература | -40°C ~ 85°C |
| Працоўная вільготнасць | 5% RH ~ 95% RH |
| Падтрымліваюцца аперацыйныя сістэмы | Mac, Linux, Android, Windows 11/10/8.1/8/7 |
| Памеры ўпакоўкі | 6.14 х 4.33 х 1.26 цалі |
| Вага прадмета | 1.76 унцыі |
| Вытворца | Waveshare |
| Дата першай даступнасці | 6 лютага 2023 г |

Figure 6: Outline Dimensions (Unit: mm)
8. Тэхнічнае абслугоўванне
To ensure the longevity and optimal performance of your waveshare FT232RNL converter, follow these maintenance guidelines:
- Уборка: Use a soft, dry cloth to clean the exterior of the device. Avoid using liquid cleaners or solvents, which may damage the casinг або ўнутраныя кампаненты.
- Асяроддзе: Operate and store the converter in a clean, dry environment, away from excessive dust, moisture, and extreme temperatures. Refer to the operating temperature and humidity specifications.
- Апрацоўка: Асцярожна звяртайцеся з прыладай. Пазбягайце падзення або моцных удараў, бо гэта можа пашкодзіць унутраную электроніку.
- Сувязі: Ensure all cable connections are secure and free from strain. Periodically check screw terminals for tightness.
9. Выпраўленне непаладак
If you encounter issues with your waveshare FT232RNL converter, consider the following troubleshooting steps:
- Няма харчавання (святлодыёд PWR выключаны):
- Пераканайцеся, што кабель USB надзейна падключаны як да канвертара, так і да галоўнага кампутара.
- Паспрабуйце іншы порт USB на вашым кампутары.
- Verify that your computer's USB port is providing power.
- No Data Transmission (TXD/RXD LEDs not flashing):
- Check all serial connections (RS232, RS485, RS422, TTL) for correct wiring and secure connections.
- Verify that the serial communication software on your computer is correctly configured (COM port, baud rate, data bits, parity, stop bits).
- Ensure the TTL level switch is set correctly for your TTL device (3.3V or 5V).
- Confirm that the connected serial device is powered on and functioning correctly.
- Праблемы з драйверамі:
- If the device is not recognized by your operating system, try reinstalling the FTDI drivers. These can typically be found on the FTDI webсайт.
- Check your device manager (Windows) or equivalent system information (Linux/Mac) to see if the device is listed without errors.
- Перашкоды:
- While the device has strong anti-interference capabilities, ensure it is not placed near strong electromagnetic interference sources.
10. Гарантыя і падтрымка
For warranty information, technical support, or further assistance with your waveshare FT232RNL USB to RS232/485/422/TTL Interface Converter, please contact waveshare directly through their official webсайт або прадаўца, у якога вы набылі тавар.
Афіцыйнае кіраўніцтва карыстальніка ў фармаце PDF таксама даступна для запампоўкі: Кіраўніцтва карыстальніка (PDF)