SerialPort: setSignals() method

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Note: This feature is available in Dedicated Web Workers.

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

Syntax

js
setSignals()
setSignals(options)

Parameters

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.

Return value

Exceptions

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.

Specifications

Specification
Web Serial API
# dom-serialport-setsignals

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
setSignals
Experimental

Legend

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Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.