HDMI KVM switch 21HK/41HK RS232 control code
| Serial port settings | Baud rate 9600bps, 8 data, 1 stop, check digit None |
| Command | Format (5 bytes hexadecimal) |
| Enter 1 | 0x30 0x30 0x30 0x0d 0x0a |
| Enter 2 | 0x30 0x30 0x31 0x0d 0x0a |
| Enter 3 | 0x30 0x30 0x32 0x0d 0x0a |
| Enter 4 | 0x30 0x30 0x33 0x0d 0x0a |
| Enter 5 | 0x30 0x30 0x34 0x0d 0x0a |
| Enter 6 | 0x30 0x30 0x35 0x0d 0x0a |
| Enter 7 | 0x30 0x30 0x36 0x0d 0x0a |
| Enter 8 | 0x30 0x30 0x37 0x0d 0x0a |
| Enter 9 | 0x30 0x30 0x38 0x0d 0x0a |
| Enter 10 | 0x30 0x30 0x39 0x0d 0x0a |
| Enter 11 | 0x30 0x30 0x40 0x0d 0x0a |
| Enter 12 | 0x30 0x30 0x41 0x0d 0x0a |
| Enter 13 | 0x30 0x30 0x42 0x0d 0x0a |
| Enter 14 | 0x30 0x30 0x43 0x0d 0x0a |
| Enter 15 | 0x30 0x30 0x44 0x0d 0x0a |
| Enter 16 | 0x30 0x30 0x45 0x0d 0x0a |
Note: Do not remove the0xin front of the code when testing