Features: This hub uses industrial-grade super anti-interference chips and surge protection and electrostatic protection circuits Load capacity: each channel supports up to 128 devices;Support 152.2Kbps high baud rate Two-way communication, Plug and play, no driver required,easy to use Good heat dissipation and stable performance Widely used in industrial systems, communication , transportation, education, finance, electricity, security, charging systems etc Package Includes: 1 PC x 1 to 8 RS485 HUB Specifications: Item: Industrial Isolated 1 to 8 RS485 HUB Model: TX1178 Terminal type: 2-position terminal block Size: approx 115x80x30mm/4.53x3.15x1.18in Transmission distance: 1200M Load capacity: each channel supports up to 128 devices Transmission medium: shielded wire or twisted pair Working environment: -20-80 Power supply: 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.