Great product if you need console access to serial ports/devices. Used on Cisco devices, ,works great. You need to know the pin out for the DIGI device, you can not connect the Cisco console cable directly and expect to work.
You will need to look at the DIGI wiring document they have. I made my own female to female adapter and that way I was able to use the cisco console cable from cisco device to adapter and then use a regular patch cable from the other end of the adapter to the DIGI device.
Very powerful firmware, make sure you get the latest model, the legacy model firmware is not as powerful, does not have the same features.
Love the fact that you can access the ports from within an ssh session to the DIGI device, or directly by specifying the port number or by using a software like putty and TeraTerm and pointing to the DIGI IP interface.
DIGI INTERNATIONAL DIGI PORTSERVER TS 4 PORT RS-232 RJ-45 SERIAL TO ETHERNET DEVICE SERVER 9-30VDC.Product Type: Device Server|Form Factor: Wall Mountable.Portserver Ts 4PORT RS-232 Serial To Ethernet Device Server