Use a rs485 communication module

Sorry it does not work
there is no callback on serial therefor you pulse on the TX_ENABLE_PIN ok.
but initiate the serial with the TX pin ...
i've tried this

var TX_ENABLE_PIN = A8;
var TX_PIN = B6;

function sendData(data) {
	digitalPulse(TX_ENABLE_PIN,1, (data.length+1)*10/19200);
	Serial1.write(data);
	console.log("envoie data", data.toString());
}

function onInit() {
	Serial1.setup(19200,{tx:TX_PIN});
	setInterval(sendData, 2000, [0x80,0x87,0xFF,0x01,0x01,0x01,0x01,0x7F,0x7F,0x7F,0x8F]);
}

is it good or i can't use serial1 with usb plugged?