USB TO RS485 (D)
USB TO RS485 (D) is an industrial-grade isolated USB-to-RJ45 single-channel RS485 converter, featuring the FT232RNL chip and an isolated RS485 transceiver circuit. The product includes a USB-A connector and a 2 m cable, with the RJ45 interface using the T568B wiring scheme.
| SKU | Product |
|---|---|
| 35209 | USB TO RS485 (D) |
Features
- Supports bidirectional communication between USB and a single RS485 channel, with hardware automatically controlling data transmit/receive direction
- Uses the FT232RNL USB-to-UART chip
- Isolated RS485 transceiver integrates signal isolation and isolated power supply
- USB side and RS485 side equipped with transient surge and ESD protection circuits
- Onboard self-recovery fuse, protection diodes, and 120 Ω termination resistor switch
- RJ45 interface provides 5 V auxiliary power output, maximum output current 100 mA
- Equipped with PWR, TXD, RXD indicators
- Supports Windows, macOS, Linux, Android, and WinCE
Product Specifications
| Parameter | Description |
|---|---|
| Product Type | Industrial-grade isolated USB-to-RJ45 single-channel RS485 converter |
| Communication Chip | FT232RNL |
| Communication Rate | 300 bps - 512000 bps |
| Host Interface | USB-A, 5 V operating level |
| Device Interface | RJ45 single-channel RS485, T568B wiring |
| RS485 Pinout | 1=A, 2=B, 3=NC, 4=5 V, 5=5 V, 6=NC, 7=GND, 8=GND |
| Auxiliary Power Output | 5 V, maximum output current 100 mA |
| Direction Control | Hardware automatically determines and controls data transmission direction |
| RS485 Nodes | Point-to-multipoint communication, up to 32 nodes; a repeater is recommended when exceeding 16 nodes |
| RS485 Transmission Distance | Approximately 1200 m (at low baud rates and with ideal cable conditions) |
| USB Transmission Distance | Approximately 5 m |
| Termination Matching | Onboard 120 Ω termination resistor switch |
| Isolation Method | Isolated RS485 transceiver with integrated signal isolation and isolated power supply |
| Cable | Black PVC jacket, length 2 m |
| Operating Temperature | -40°C - 85°C |
| Operating Humidity | 5% RH - 95% RH |
| Operating Systems | Windows 11 / 10 / 8.1 / 8 / 7 / XP, macOS, Linux, Android, WinCE |
RJ45 Pinout
The RJ45 interface uses the T568B wiring scheme. This interface is used for RS485 signals and power, and is not an Ethernet port.
| Pin | T568B Color | Signal | Description |
|---|---|---|---|
| 1 | White/Orange | A | RS485 differential signal A |
| 2 | Orange | B | RS485 differential signal B |
| 3 | White/Green | NC | Not connected |
| 4 | Blue | 5 V | 5 V auxiliary power output |
| 5 | White/Blue | 5 V | 5 V auxiliary power output |
| 6 | Green | NC | Not connected |
| 7 | White/Brown | GND | Power ground and RS485 reference ground |
| 8 | Brown | GND | Power ground and RS485 reference ground |
The maximum output current for the 5 V auxiliary power on the RJ45 interface is 100 mA. Before connecting external devices, verify their operating voltage and current requirements.
This RJ45 interface does not support Ethernet. Before connecting to a device, verify the RJ45 pinout of the peer device; do not connect this product to switches, routers, or other Ethernet ports. If the peer does not use the power pins, leave pins 4 and 5 disconnected; when using the auxiliary power, ensure the load current does not exceed 100 mA.
Indicator Descriptions
| LED Indicator | Status Description |
|---|---|
| PWR | Lights red when USB is connected and voltage is detected |
| TXD | Lights red when data is being sent from the USB side |
| RXD | Lights red when data is being returned from the RS485 device side |
Isolation and Protection
The product uses an RS485 transceiver that integrates signal isolation and an isolated power supply. The USB side and RS485 side are equipped with TVS, ESD protection devices, a self-recovery fuse, and protection diodes to suppress the effects of transient surges, electrostatic discharge, overcurrent, and overvoltage on the interfaces. Isolation and protection circuits do not replace on-site grounding, shielding, or lightning protection measures.
Product Dimensions
