SerialPort.getSignals()

The SerialPort.getSignals() method of the SerialPort interface returns a Promise that resolves with an object containing the current state of the port's control signals.

Syntax

var promise = SerialPort.getSignals();

Parameters

None.

Return value

Returns a Promise that resolves with an object containing the following members:

clearToSend

A boolean indicating to the other end of a serial connection that is is clear to send data.

dataCarrierDetect

A boolean that toggles the control signal needed to communicate over a serial connection.

dataSetReady

A boolean indicating whether the device is ready to send and receive data.

ringIndicator

A boolean indicating whether a ring signal should be sent down the serial connection.

Exceptions

DOMException "InvalidStateError"

Indicates that the port is not open. Call SerialPort.open() to avoid this error.

DOMException NetworkError

Indicates that one of the signals on the device could not be set.

Specifications

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
getSignals	89	89	No	No	No	No	No	No	No	No	No	No