If you prefer keeping data local, here’s a 10-line parser for Modbus RTU responses:
If you have a .pcap file, you can use online packet analyzers like CloudShark to view the Modbus breakdown in a browser. How to Evaluate a Modbus Parser modbus parser online best
If you'd like, I can also of this Modbus parser with all the core features. Just let me know. If you prefer keeping data local, here’s a