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  RS232/RS422/RS485 Double-Ring Self-Healing Converter MM
  RS232/RS422/RS485 Double-Ring Self-Healing Converter SM
  - Master and slaver port could choose RS232/RS422/RS485  
  - When slave appears to be power-down, fiber optic line broken and failure connect, it will automatically reconnect and self-healing time is less than 20ms  
  - It has full signal serial port, fiber optic port and power indicating lights. It could built ring network and line network  
  - Industrial level design, all surface adhibit technique  
  - Protects equipment by avoiding loop voltage, surge, induction lightning stroke, static electricity.<20ms  
  - Transparent transfer, baud rate adaptive, no need to change protocol and hot swap