This is the description of the Modbus protocol for the Dual Button Bricklet. General information and technical
specifications for the Dual Button Bricklet are summarized in its hardware description.
A general description of the Modbus protocol structure can be found
Sets the state of the LEDs. Possible states are:
In auto toggle mode the LED is toggled automatically at each press of a button.
If you just want to set one of the LEDs and don't know the current state
of the other LED, you can get the state with get_led_state or you
can use set_selected_led_state.
The default value is (1, 1).
The following meanings are defined for the parameters of this function:
Returns the current state of the LEDs, as set by set_led_state.
Returns the current state for both buttons. Possible states are:
Sets the state of the selected LED (0 or 1).
The other LED remains untouched.
Returns the UID, the UID where the Bricklet is connected to,
the position, the hardware and firmware version as well as the
The position can be 'a', 'b', 'c' or 'd'.
The device identifier numbers can be found here.
This callback is called whenever a button is pressed.
Possible states for buttons are:
Possible states for LEDs are: