Industrial isolated USB to RS232 RS485 TTL Multibus converter Waveshare
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Industrial isolated Multi-Bus USB / RS232 / RS485 / TTL (UART) converter – Waveshare (SKU: 21411)
Isolated converter for communication between USB, RS232, RS485, and TTL (UART) buses. The device is suitable for industrial automation, control systems, and applications requiring stable, interference-resistant transmission.
Built-in power and signal isolation as well as protection circuits (including TVS, resettable fuse) help protect equipment in environments exposed to surges, ESD discharges, and interference. The aluminum alloy metal housing increases durability and mechanical resistance.
Key features:
- Industrial, isolated multi-bus converter: USB / RS232 / TTL (UART) ↔ RS232 / RS485 / TTL (UART).
- Original FT232RL chip for USB communication.
- Power isolation.
- Digital isolation – signal separation.
- Surge and voltage spike suppression, ESD protection.
- Overcurrent and overvoltage protection.
- Transmission line protection (RS232/RS485): TVS, surge suppression, ESD protection.
- TTL level switch 3.3V / 5V for the TTL terminal in group B.
- 3 LED indicators for power and TX/RX status.
- Robust aluminum alloy housing.
Operation description and communication principles
The converter has two independent sets of interfaces labeled as Group A and Group B. Data transmission occurs between terminals from different groups (A ↔ B). Terminals within the same group do not communicate with each other.
- Communication occurs only between groups: Group A ↔ Group B.
- Terminals in the same group cannot communicate with each other.
- Terminals in the same group cannot transmit simultaneously (simultaneous reception is allowed).
- At any given time, only one pair of devices is matched ensuring full communication between Group A and Group B.
Interfaces and protocol conversion (Multi-protocol / Multi-bus)
The device performs data conversion and transmission between interfaces in two directions. Depending on the configuration, data can be sent from Group A to Group B or vice versa.
Data transmission: Group A → Group B
Data transmission: Group B → Group A
LEDs – operation signaling
On the housing, there are 3 LEDs, which facilitate quick checking of power and transmission status (TX/RX).
Pinout
The diagram below shows the pin definitions for connectors and terminals (depending on the selected communication mode).
Outline dimensions
Technical specification
- Product type: Industrial Isolated Multi-bus USB/RS232/RS485/TTL Converter
- Baud rate: 300 ~ 921600 bps
- Speed (RS232 → RS232): 300 ~ 600000 bps
- System support: Windows 11 / 10 / 8.1 / 8 / 7 / XP
- Operating temperature: -25°C ~ 85°C
- Operating humidity: 5%RH ~ 95%RH
- Housing: aluminum alloy, matte surface (anodized)
- Isolation: power + digital (signal), built-in protections
- Signaling: 3× LED (power, TX/RX)
- Application: automation, control, industrial systems, high-demand communication
Interfaces – Group A
USB
- Operating voltage: 5V
- Connector: USB-B
- Protection: resettable fuse 200mA, isolated output
RS232
- Connector: DB9 male
- Protection: TVS, surge suppression, ESD protection
- Transmission mode: point-to-point
TTL (UART)
- Operating voltage: 5V
- Connector: screw terminal
- Pinout: TXD, RXD, GND, 5V
- Protection: clamping diode, overvoltage protection, reverse polarity protection, interference resistance
Interfaces – Group B
RS485
- Connector: screw terminal
- Pinout: A+, B-, GND
- Direction control: automatic (hardware auto control)
- Protection: ESD protection, surge suppression, surge/overvoltage resistance
- Transmission mode: point-to-multipoints (up to 32 nodes; for 16+ repeaters recommended)
RS232
- Connector: DB9 male
- Protection: TVS, surge suppression, ESD protection
- Transmission mode: point-to-point
TTL (UART)
- Operating voltage: 3.3V / 5V (switchable)
- Connector: screw terminal
- Pinout: TXD, RXD, GND
- Protection: clamping diode, overvoltage protection, reverse polarity protection, interference resistance
Package contents
- Multibus Converter × 1
- USB cable (~1.2 m) × 1
Safety
Shipping costs
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