SerialPort.setSignals()

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The setSignals() method of the SerialPort interface sets control signals on the port and returns a Promise that resolves when they are set.

Syntax

setSignals()
setSignals(options)

options Optional

An object with any of the following values:

dataTerminalReady: A boolean indicating whether to invoke the operating system to either assert (if true) or de-assert (if false) the "data terminal ready" or "DTR" signal on the serial port.
requestToSend: A boolean indicating whether to invoke the operating system to either assert (if true) or de-assert (if false) the "request to send" or "RTS" signal on the serial port.
break: A boolean indicating whether to invoke the operating system to either assert (if true) or de-assert (if false) the "break" signal on the serial port.

InvalidStateError DOMException: Returned if the port is not open. Call SerialPort.open() to avoid this error.
NetworkError DOMException: Returned if the signals on the device could not be set.

Specification
Web Serial API # dom-serialport-setsignals

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`setSignals`	89	89	No	No	75	No	No	No	No	No	No	No

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https://developer.mozilla.org/en-US/docs/Web/API/SerialPort/setSignals