RS485 serial port hub circuit board program development
RS485 serial port hub circuit board program development
Technical Parameters:
product description
RS485/RS232 to 4-port RS485 photoelectric isolation hub (RS485-HUB-4C) is a RS485 bus splitting hub (HUB) designed specifically to solve the requirements of large RS485 systems in complex electromagnetic field environments. A 485 hub that uses ASIC to implement soft switching. Built-in 1 2W DC/DC isolation module, RS485 output interface uses high-speed optocoupler for 2500V photoelectric isolation and level 2 lightning protection-TVS tube 600W lightning protection, B3D090L discharge tube 90V5KA lightning protection, which can effectively prevent static electricity from the RS485 bus , Lightning strikes, surges, and ground potential differences.
In the RS485 working mode, the adopted discrimination circuit can automatically sense the direction of the data flow, and automatically switch the enable control circuit to easily solve the problem of RS485 transceiver conversion delay. The RS485 interface has a transmission distance of more than 1500 meters and stable performance. It is widely used in highway toll systems, road monitoring systems and power acquisition systems. It is a data interface conversion product with excellent performance and good price.
RS485/RS232 to 4-port RS485 photoelectric isolation hub (RS485-HUB-4C) provides star RS485 bus connection. Each port has short-circuit and open-circuit protection, and photoelectric isolation. Users can easily improve the RS485 bus structure, divide network segments, and improve communication reliability. When lightning strikes or equipment failure occurs, the network segment with the problem will be isolated to ensure the normal operation of other network segments. This performance greatly improves the reliability of the existing RS485 network and effectively shortens the maintenance time of the network.
Features
◆Industrial rail installation, Yadan module
◆Compatible with RS-232, RS-485 TIA/EIA standards
◆Each port implements high-speed detection, automatic fault isolation and recovery.
◆Automatically send/receive data, without external flow control signal (RTS), true three-wire (TXD.RXD.GND) communication
◆Input interface: RS232 and RS485 interface
◆Output interface: Four RS-485 interface (photoelectric isolation between main branches)
◆Communication rate: 300BPS-200KBPS
◆Working power supply: 9-30VDC/500mA (wide voltage input, there is a dedicated power supply isolation module inside)
◆ Each RS485 interface can connect 128 RS485 interface devices
◆Communication distance: ＞1.5Km (9.6Kbps)
◆Signal indication: seven signal indicator lights power (PWR), send (TXD), receive (RXD), fault (E1-E4)
◆Working mode: Asynchronous half-duplex (RS485)
◆Reinforced photoelectric isolation (isolation voltage 2.5KVrms /500VDC insulation), 1 2W dedicated DC/DC module, RS485 provides 2 levels of lightning protection per line-TVS tube 600W lightning protection, B3D090L discharge tube 90V5KA lightning protection, surge protection , +/-15KV ESD protection and prevent common ground interference
◆Electrical interface: RS232C interface is ten-position terminal block, RS485 interface is ten-position terminal block
◆Transmission medium: twisted pair or shielded wire
◆Dimensions: 120mm*70mm*25mm
◆Using environment: -40℃ to 85℃, relative humidity is 5% to 95%
◆Suitable for all communication software used, plug and play
◆Support DOS/WIN95/WIN98/WIN2000/NT/XP Linux, etc.
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