Industrial 1 SFP & 4 Port Gigabit Ethernet Switch – Brainboxes ED-204, Brainboxes ED-204 Ethernet to 4 Digital IO and RS232 Serial Port Ethernet Switch has powerful ARM 80 MHz, 32 Bit CPU and offers robust and intelligent ‘control side’ devices that provide the interface to systems on the 24V factory floor environment, commonly referred to as ‘process side’. The device installs as a COM Port on the PC to give complete backwards compatibility essential for legacy applications.Typical applications are control and switching of AC and DC motors, Fans, relay drivers, pumps, Voltage Regulators and Battery Chargers, LEDs and Bulbs, Air Conditioning, Heaters and Solenoids.. Brainboxes ED-204 Ethernet to 4 Digital IO and RS232 Serial Port Ethernet Switch