12DO(Source type) Modbus RS-485 Remote I/O 12ch source type digital output Protocols:Modbus RTU,ASCII Watchdog timer to recover the system 5000VDC isolation protection www.advantech.com/en/products/gf-5vwk/adam-4056so/mod_a8f52a9c-18c6-433f-9868-5b2969eff8e7