serialport interface for batch style commands
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serial-io

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serialport interface for batch style commands

This module is a promise based wrapper for the node-serialport package. It allows you to interact with devices on a command & response basis. Based on a defined terminator or timing behavior the end of a response is deterimed and the complete response returned as a resolved Promise.

Install

$ npm install --save serial-io

Usage

const serialIo = require('serial-io');

// this will send HELLO to the device and resolve with
//  anything that gets received within 100ms
serialIo.send('thisPortName', 'HELLO')
.then(response => console.log(`device responded:\n${response}`))

// if you don't know the devices port name try
serialIo.ports().then(console.log.bind(console))

// will show the response of a device on port '/dev/cu.usbmodem1411' (assuming it reacts to 'version\n')
serialIo.send('/dev/cu.usbmodem1411', 'version\n').then(console.log.bind(console))

API

The package exposes two APIs with different abstraction levels. Directly interacting with the serialIo objects gives you the highest level of abstraction. If you use serialIo.connect() you get a Connection object returned that allows you to do things like multiple requests without re-connecting every time.

All methods are promise-based.

serialIo.ports()

Resolves to a list of available serial ports. Refer to the serialport documentation for a specification of the returned data.

serialIo.send(portName, content, {options})

Single interaction with a device. Opens up a connection, transmits the content and waits for the response to resolve the returned Promise.

portName

Type: string

A valid portname.

content

Type: string

Payload to send.

options

terminator

Type: string
Default: none

If the specified terminator string/character is found within the response the Promise is resolved immediately with the capture data. The returned data includes the terminator.

timeoutInit

Type: number in ms
Default: 100

Time to listen to the device for a (first) response.

timeoutRolling

Type: number in ms
Default: 10

Time to wait after receiving a data chunk until the next one arrives. If the timer runs out the response is resolved.

serialIo.connect(portName, {options})

Opens up a Connection to the given port.

portName

Type: string

A valid portname.

options

Refer to serialport openOptions for an overview of available options.

connection.close()

Closes the Connection instance.

connection.send(content, {options})

Send content over the connection and wait for an answer. The method returns a Promise that will resolve to the received answer. Using options you can define how listening to answer is done.

content

Type: string

Payload to send.

options

terminator

Type: string
Default: none

If the specified terminator string/character is found within the response the Promise is resolved immediately with the capture data. The returned data includes the terminator.

timeoutInit

Type: number in ms
Default: 100

Time to listen to the device for a (first) response.

timeoutRolling

Type: number in ms
Default: 10

Time to wait after receiving a data chunk until the next one arrives. If the timer runs out the response is resolved.

connection.getState()

Tells you something about the current connection.

License

MIT © anoff