Enter Command mode

There are two ways to enter Command mode:

1. To get a device to switch into this mode, you must issue a unique string of text in a special way: +++ (default). When the device sees a full second of silence in the data stream followed by the string +++ (without Enter or Return) and another full second of silence, it knows to stop sending data through and start accepting commands locally.
   Do not press Return or Enter after typing +++ because it will interrupt the guard time silence and prevent you from entering Command mode.

2. If a serial break (DIN held low) signal is sent for over five seconds, the device resets, and it boots into Command mode with default baud settings (9600 baud).

3. If a serial break is observed upon boot, Command mode will similarly be entered.

The device sends the letters OK followed by a carriage return out of the UART to indicate that it entered Command mode.

You can customize the guard times and timeout in the device’s configuration settings. See CC (Command Sequence Character), BT (Guard Time Before) and AT (Guard Time After).