Are you referring to the Yaesu SCU-17? If so, the information in the Instruction Manual seems to be pretty clear. While the examples shown in the manual are for Yaesu radios, they should provide enough information for interfacing this unit with any radio that has receive audio, transmit audio, PTT, and ground available for outside connections.
This forum may have an international reach, but most of the members are in the U.S. The rules for Citizens Band in the U.S. allow only voice to be transmitted. I suspect that there is very little interest in the U.S. for using the SCU-17 with CB. As a result, not many people here are going to be able to help you.