Interface features: compatible with RS-485 standard of EIA/TIA. Electric interface: 10-bit wiring post connector for both input and output ends of RS-485. Protection Grade: Impose a protection of 600W on each line of RS-422 and RS-485 interfaces for lightning surge, ±15KV ESD protection. Isolation degree: an isolation voltage of 2,500 Vrms, 500VDC non-stop and DC/DC isolation module. Working mode: asynchronous half-duplex. Signal indication: 5 indicator lights for Power (PWR), 2 for Send (TXD) and another 2 for Receive (RXD). Transmission media: twisted-pair cable or shielded cable. Transmission rate: 300-115.2K BPS Dimensions: 120mm×72mm×22mm Working environment: -40℃ to 85℃, relative humidity 5% to 95%. Transmission distance: 0-5,000meters (115,200bps-9,600bps)