Industrial 8 Port RS485 Hub

The 8-port RS485 isolated hub features 8 fully electrically isolated RS485 channels, each with an independent RS485 transceiver. It enables transparent transmission for 8 RS485 networks, eliminating the maximum node limitation imposed by the RS485 transceiver on the system bus. This allows for complex multi-point connections at the bus level, eliminating branch length restrictions on the main network and providing users with flexible wiring options.

The device supports a baud rate range of 0 to 115200 bps on each port. All channels operate at the same baud rate, ensuring minimal transmission delay. Compliant with the RS485 standard, it facilitates transparent and protocol-independent RS485 message transmission, making it suitable for various applications such as the Modbus protocol. Additionally, the upstream port of the 8-channel RS485 isolation hub can be configured with an RS232 port, eliminating the need for additional RS485 to RS232 converters when connecting monitoring devices like PCs to the network. In the event of lightning strikes or equipment failures, the affected segment will be isolated to ensure the normal operation of other segments. This significantly enhances the reliability of existing RS485 networks and effectively reduces network maintenance time.

Each of the 8 channels of the RS485 isolated hub offers 6kV lightning protection, opto-isolation, and an isolation voltage of up to 2.5kV. Furthermore, each channel has an independent ground, protecting devices on other RS485 buses in the event of damage to one RS485 bus, each RS485 port can carry up to 128 nodes. The RS485 ports, power supply, and RS232 port of the hub also possess 6kV lightning protection capabilities.

● This device is designed based on FPGA architecture and automatically generates precise RS485 transmit/receive switching enable signals according to the transmitted data. It offers automatic detection and control of RS-485 data flow with superior performance compared to conventional Schmitt trigger enable generation methods.

● Each RS485 channel in this device is equipped with a 6kV lightning protection capability, 2.5kV optoelectrical isolation, and an independent shield wire ground interface. Additionally, there are LED indicators for transmission and reception on each channel.

● Each RS485 channel has the capacity to support at least 32 standard nodes or 128 enhanced nodes.

● In the event of lightning strikes or device faults, the affected network segment will be isolated to ensure the normal operation of other network segments.

● The upstream port RS232/422/485 can be optionally configured with a baud rate ranging from 0 to 115200 Bps.

● The device is powered by a 2500V DC-DC power supply with isolation voltage, eliminating the possibility of serial port power theft. This enhances the versatility of the equipment, and the communication signals are transmitted using high-speed optocoupler isolation.

● It supports a wide range of AC and DC power inputs, ranging from 9V to 55V.

● It supports internal isolation and redundant dual power inputs.

● The power supply features overload protection and reverse connection protection.

● It is compliant with industrial-grade electromagnetic compatibility requirements.

● With its excellent lightning protection capabilities, the device is able to withstand lightning strikes, high voltage induction, surges, and other related phenomena.

● It is designed for fanless operation, ensuring efficient heat dissipation and reducing repair time.

● The device’s enclosure is made of anodized aluminum alloy, providing an IP40 protection rating and enabling it to withstand challenging environmental conditions.

● It can be mounted on a din rail or wall.

● Working temperature – 40 ℃ ~ + 85 ℃.

● It has passed the 100% burn-in test.

● Serial

EIA/TIA-232 RS-232 (ITU-T V.28)

EIA/TIA-422 RS-422 (ITU-T V.11)

EIA/TIA-485 RS-485 (ISO/IEC8284)

Serial interface:

RS-422: TxD+ TxD- RxD+ RxD-

RS-485 4 wires: TXD + TXD – RXD + RXD –

RS-485 2 wires: A (corresponding to TX +) B (corresponding to TX -) GND

RS-232: RXD TXD GND

● Environmental Indicators

Working temperature: – 40 ℃ – + 85 ℃

Storage temperature: – 40 ℃ – + 85 ℃

Working humidity: 0% – 95% (no condensation)

MTBF: > 100000 hours