Node-serialport: Is there a way to disabled DTR before openning a port

[AlexandreRouma]

Hi, I'm trying to connect to an arduino without causing it to reset.
The arduino resets when DTR is set to enable. The problem is that whenever you open a port, the lib enables DTR and messes everything up :/

Hope you can help, thanks!

[reconbot]

I might be able to to be proven wrong but I think this is an os thing.

On Sun, Jul 22, 2018, 8:15 PM AlexandreRouma [e-mail]
wrote:

Hi, I'm trying to connect to an arduino without causing it to reset.
The arduino resets when DTR is set to enable. The problem is that whenever
you open a port, the lib enables DTR and messes everything up :/

Hope you can help, thanks!

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[reconbot]

I also recall you can disable the drt>reset link physically by cutting a
wire on the board.

On Sun, Jul 22, 2018, 9:13 PM Francis Gulotta [e-mail] wrote:

I might be able to to be proven wrong but I think this is an os thing.

On Sun, Jul 22, 2018, 8:15 PM AlexandreRouma [e-mail]
wrote:

Hi, I'm trying to connect to an arduino without causing it to reset.
The arduino resets when DTR is set to enable. The problem is that
whenever you open a port, the lib enables DTR and messes everything up :/

Hope you can help, thanks!

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[AlexandreRouma]

I could cut the trace but then it gets annoying to program the arduino :/
And no, it also happens linux. It's written in the description for the port.set() function that DTR is on by default: https://node-serialport.github.io/node-serialport/SerialPort.html#set

Thanks for responding :)

[kjhe11e]

@AlexandreRouma I also have a device that resets when DTR is enabled. The following worked for me:

this.serial.on("open", function () {
    console.log("Serial port opened to device");
    self.serial.set({dtr: false});
});

[AlexandreRouma]

I tried that but sadly, it still sends a short pulse which resets the MCU :/

[Tuhis]

Hi,

at least on windows platform undocumented "hupcl: false" option works for me with Arduino.

    this.port = new SerialPort(this.serialportName, {
            baudRate: 250000,
            hupcl: false,
            dataBits: 8,
            stopBits: 1,
            parity: "none"
        });

[AlexandreRouma]

Thanks! Gonna try that. I hope they can bring it to linux cause it's suppose to run on an RPi, but that should be enough for testing!

[tablatronix]

@kjhe11e tried this on osx, didn't work, causes no data to emit

Seems to be driver dependant on osx and linux

ref
http://playground.arduino.cc/Main/DisablingAutoResetOnSerialConnection

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in a week no further activity occurs. Feel free continue the discussion or ask for a never-stale label to keep it open. If this is a support issue, consider sharing it on stack overflow to get more eyes on your problem.

[tablatronix]

Why are labelled issues marked stale, kind of lame

[reconbot]

There are a high number of abandoned support issues from people who never finished debugging, which is also kind of lame.

[lefuturiste]

Hi, on my raspberry pi, I managed to disable DTR, I used the command stty -F /dev/ttyUSB0 -hupcl before running my Node.js script. It work great once, but when I run my Node.js script a second time, the DTR seem to be disabled like before.

[kjhe11e]

@lefuturiste what is your goal? Do you want DTR enabled on the second run of the script?

[lefuturiste]

@kjhe11e I want DTR to be enabled at every run of the script.