Description
USB TO 4CH RS232/485
4-channel isolated USB converter for industrial environments. Original FT4232HL chip. ADI hardware isolation. 9 LED indicators. Multi-level protection against interference and overvoltage.
Built-in RS485 terminating resistor — 120 Ohm
The RS485 outputs of ports A and B have a built-in 120Ω terminating resistor. Switching on/off is done via a DIP switch on the housing without opening the device. It is recommended to switch on at the end devices of a long RS485 bus to eliminate signal reflections.
RS485 (ports A/B)
RS232 (ports A / B / C / D)
TVS protection
Suppression of impulse surges and electrostatic discharges (ESD). Lightning protection.
Power isolation
Built-in isolated DC-DC converter - no external power supply required for isolated lines.
ADI Magnetic Isolation
Digital magnetic isolation from Analog Devices — reliable signal transmission with minimal power consumption.
Self-resetting fuse
Resettable fuse + protective diodes. Overcurrent and voltage protection.
| Chip | Original FTDI FT4232HL (industrial grade) |
| Number of channels | 4 independent serial ports (A–D) |
| Ports A/B | Isolated RS232/RS485 (switchable) |
| C/D ports | Isolated RS232 |
| RS485 mode | Half-duplex |
| RS232 mode | Full-duplex |
| Transmission speed | Up to 115200 baud |
| Terminal resistor | 120Ω on RS485 outputs A/B, enabled by DIP switch |
| LED indicators | 9 pcs: PWR (red), TXD (green), RXD (blue) × 4 ports |
| Insulation type | Power isolation + ADI digital magnetic isolation |
| Protection | TVS, self-recovery fuse, protection diodes, ESD |
| Transceiver mode | Fully automatic, TX/RX switching without delay |
| Operating temperature | −15°C … +70°C |
| Humidity | 5% RH … 95% RH |
| Corps | Aluminum alloy - sandblasting + anodizing (CNC) |
| Assembling | Wall and 35 mm DIN rail mounting |
| Interfaces | USB (host) + terminal blocks (serial ports) |
| Driver | VCP (FTDI) — no driver required on Linux |
Industrial automation
PLC, CNC, SCADA, HMI and field devices
Equipment setup
Simultaneous connection to 4 serial devices
Integration of legacy equipment
Connecting RS232/RS485 devices to modern PCs
Data collection
Sensors, measuring instruments, monitoring systems
Wall mounting
Panel or wall mounting for fixed installations
DIN rail (35 mm)
Standard rail — for industrial control cabinets
Desktop use
Compact housing is convenient for laboratory and bench use
Ready to use immediately after plugging in
Connect the device, install the FTDI VCP driver, and all four ports are ready. On Linux, no driver is needed at all.
View on Waveshare
