This device means that you can connect two serial devices to your network. It features two 9 Way serial ports which can support RS-232, RS-422 & RS-485 equipment such as medical apparatus, industrial & manufacturing machinery, point of sale peripherals etc. With this IP server multiple users can access the connected serial devices from anywhere on the local area network. Package Contents: 4 Port IP Serial Server PSU 12V 0.5 Amp User manual