485 hub 8-port HUB
Optically isolated hub
485 one in eight out HUB|With 232 input|Pure hardware equipment, not restricted by protocol
Each 485 port can parallel 256 devices at the same time | power isolation and signal isolation between each channel
Strong anti-interference ability and long transmission distance
Built-in photoelectric isolation, providing isolation voltage of 1500V,
Can effectively suppress lightning and ESD, and effectively prevent lightning strikes and common ground interference
Interface standard: compatible and higher than EIA/TIA RS485 standard
Input/output interface: single-port RS-485 interface; output/input interface: eight-port RS-485 interface
Communication rate: 300bps-115.2Kbps
Transmission medium: two-core twisted pair or shielded twisted pair
Working mode asynchronous half duplex (RS-485)
Isolation performance: efficient isolation of each channel
Protection circuit: 1500W surge protection, 15KV∨ static protection (short circuit and open circuit protection between each road, short circuit or open circuit will not affect the work of other circuits)
Working power supply: 9-24∨DC/20mA, dedicated DCDC module power supply, anti-reverse protection
Number of interfaces: Each RS-485 interface can connect 128 devices
Communication distance: Each pair of RS485 lines adds 1200 meters of transmission distance to the original transmission distance
Power and signal indication: red power data LED, a total of six indicators
Suitable for all communication software, has nothing to do with the protocol, plug and play
Dimensions: 100mmX70mmX43mm
Shell: high-quality plastic shell, high insulation safety factor
Color: dark blue
Operating environment: temperature is -40°C to 85°C, relative humidity is 5% to 95
Cascade: RS485 terminal can cascade up to 256 RS485 devices.
Product manual:
RJ485hub-H8 is an adaptive two-way 485 hub, which can be used as a 485 sharer and a distributor. This hub uses industrial-grade super anti-jamming chips and surge protection and electrostatic protection circuits. The built-in circuit intelligent discrimination circuit can automatically sense the direction of the data flow, and automatically switch the control circuit, which can easily solve the problem of RS-485 transceiver conversion delay. It is a data interface conversion product with excellent performance and good price. This RS485 hub is simple to use, only need to connect the hub to the communication network, no additional control data flow direction is required in use, the converter automatically controls the data transmission and reception flow direction. The entire communication transmission process is completely transparent. The product is designed in accordance with the concept of industrial control standards, and has the characteristics of strong anti-interference ability, long transmission distance, high speed, and stable operation.
Model option:
Stand type:Isolation and protection level is suitable for security monitoring field
Photoelectric isolation type:On the basis of the common type, each port has added the functions of photoelectric isolation and electrical isolation. Generally used in complex electromagnetic interference environment.
Signal ground
All devices on the same network segment must have a unified signal ground to avoid common mode interference.
In centralized power supply, connect the DC negative poles of all power supplies on the same network segment (including the built-in power supply of communication equipment) directly to form a common signal ground. At this time, the signal ground is the DC power ground
When a single home supplies power independently, connect the ground (black wire) pins of all bus devices on the same network segment together to form a common signal ground
The solution of the terminal resistance is shown in the figure above. If multiple devices are connected in parallel, please connect them to the 485+ and 485 of the last 485 device and connect a 120 ohm terminal resistance to improve the communication quality.
PWR: Power indicator, normal red light is always on
TXD: According to the transmission indicator of the hub port, it flashes green normally, indicating that the data is sent from the hub port to the distribution port
RXD: According to the receiving indicator of the hub port, it flashes green normally, indicating that the data is sent from the distribution port to the hub port
CH1CH8:1-8 distribution port normal working indicator, normal flashing green
Indicate the working status of distribution ports 1-8, CH1 light corresponds to distribution port 1, and CH8 light corresponds to distribution port 8.
