Usage Tips:Features:brand and This hub uses industrial-grade super anti-interference chips and surge for protection and electrostatic for protection circuitsLoad capacity: each channel supports up to 128 devices;Support 152.2Kbps high baud rateTwo-way communication, Plug and for play, no driver required,easy to useGood heat dissipation and stable performanceWidely used in industrial systems, communication , transportation, education, finance, electricity, security, charging systems etc Specifications:Item: Industrial Isolated 1 to 8 RS485 HUBModel: TX1178Terminal type: 2-position terminal blockSize: approx 115x80x30mm/4.53x3.15x1.18inTransmission distance: 1200MLoad capacity: each channel supports up to 128 devicesTransmission medium: shielded wire or twisted pairWorking environment: -20-80Power supply: for DC 12-55V Note:Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand.Please allow 0-3mm error due to manual measurment. Package includes:1 PC x 1 to 8 RS485 HUB