The implementation of data transmission with a radio is sometimes tricky because it involves physical links (serial, USB, sound), a CAT link (Computer Aided Transceiver) and configurations of the transceiver and of the computer (PC, Raspberry Pi, …).
This article presents the configuration of an IC-7300 with an SB2000 but also with a direct USB link to interface the softwares N1MM+ and WJTX.
Have a good reading: CAT interface and IC-7300 data.