RS422 RS485 Repeater Isolation Surge Converter Built-in Terminator 120 ohm for DIP Switch Setting Full compatible with Serial RS-422/485 DC Power Supply 10 – 30V Built in Surge Protection Max 10 Device connectivity for 4 Wire RS-485(RS-422 Multi-Drop) Mode Max 32 Device Connectivity for RS-485 Mode Communication status can be monitored through LED 3KV Isolation Protection 600W Surge Protection Supports Industrial Specification No Driver Needs