[Can I change a rx200 dna from wattage to TC modes without using escribe, like if I'm in the car.]

This is the manual that worked for me.

Basic Functions:

• To Lock the device: Press the fire button 5 times and the Lock message will appear on the screen.
• To Lock the wattage: Hold the + and - wattage buttons for 5 seconds until the Power Locked message appears on the screen.
• To Lock the ohms of the atomizer: Lock the device then hold the fire button and + wattage button for 5 seconds until the message appears on the screen.
• Stealth Mode (turn the screen off): Lock the device then hold the fire button and - wattage button for 5 seconds until the message appears on the screen.
• Change temperature: Lock the device then hold the + and - wattage buttons for 5 seconds until the message appears on the screen.
• Switch between Fahrenheit and Celsius: While adjusting the temperature, scroll down from 200 Fahrenheit or 100 Celsius.
• Turn temperature control off: While adjusting the temperature, scroll up until the screen displays OFF.
• Change Profiles: While the wattage is locked, press the + or - wattage button twice and scroll through profiles with the + and - wattage buttons. Once the desired profile is selected, press the fire button to confirm selection.