Issue link: https://docs.hic.us/i/445631
21 How to use each part Chapter 2 1 2 3 4 5 6 7 8 9 10 11 PT10 2. How to use each part 2-1. Operation panel [Front face] [Back face] [Side face] USB port (p.23) Various types of key operation (p.22) USB port, LAN port (p.24)