We used the terminal speed 38400 and 9600 but as you can attached it's distorced and it only happened for the ns9200 we have.
For m1450 and m4050 we can access with no distorced console screen.
Do you know what is the default for ns9200?
The baud rate should be 115200
This is in the product guide available at the link below;
Network Security Platform NS9x00 Sensor Product Guide