Here is how to turn on the M1's wireless diagnostic data which will come out of the RS-232 serial port at 115K baud, 8bit, no parity.
From the keypad, press the Elk key, 9 key, > key, enter your installer code, 07 - Globals, > key, 44 - you are at Global G44.
> key, you will see a:00000
Enter...