Most Cyberoams have an RJ45 serial port & a cable comes with the unit. If you lose this cable however you can replace with a model 319014 OpenGear RJ45 to DB9 Female Straight Adapter (Cisco Pinout)
https://www.snappernet.co.nz/product/2831/rj45-to-db9-female-straight-adapter-cisco-pinout
