IMU/ DEPTH Sensor data converter to ASCII String?


I am looking for a Compass and a depth sensor to be used on drop camera system. I would very much like to have the depth and heading up to surface on a Ascii text string for parsing into logging software. Does anybody inside this fabulous forum know a easy way to convert the data from the OpenROV IMU/Depth sensor to a RS232/RS485 string? Or maybe there is other sensor options more suitable?
The sensor data will have a dedicated twisted pair to the surface for data transmission.