# Can I tell if the HC-06 bluetooth is connected?

I seem to see that the HC-06 device behaves like a serial device with TX/RX. I also understand that this needs to be "connected" to a blue tooth master to send/receive data. Is there a way that I can tell from the HC-06 end whether or not it has a connection to its partner?

I plan to drive the HC-06 through an Arduino.

The second is to send an AT command. For example, if you send AT when not paired, you will get back OK. If you send AT while paired, you will not get a response. You can use this to know what is happening.
• Thank you that was most helpful. The second answer troubles me though ... when it is paired, won't sending AT cause the receiver to receive those two characters? – Kolban Jun 12 '15 at 0:54