Why doesn’t the READY signal appear during remote control of TOS9300 series?

It’s by design that the READY signal doesn’t appear during remote control.
To get the READY signal in remote control:

1. Set TRIG:TEST:SOUR BUS.
2. Use INIT:TEST to enter the WTG (Waiting For Trigger) state. The READY
   signal will appear at this point.
3. Use TRIG:TEST to start the test.

Please read the communication interface manual for more details.