1. I did not understand your post.
2. What do you mean by 'Device'?
3. What 'data' are you communicating? Sensor data? User data?
4. What is your requirement on hardware side? and your budget?
Sol:
You HAVE to learn software these days since the thin line between engineering fields is disappearing. Get some books on Digital communications and digital devices.
Online you will find a lot of information. Read it up. It impossible to explain each and everything about rs232, serial, parallel, PLCs, remote devices, remote access, DAQ's and so on.
good luck
