Serial1.setConsole() is not working

Hello..

I attach a serial device to the Serial1 on ESP8266.
To retain the connection of the serial device, I put a code of

function onInit() {
   Serial1.setConsole();
}

at the begining of the program.

However, data from the serial device can't be obtained.
But, if we connect the ESP8266 using TCP in espruino web IDE, then
the data from the serial device has appeared.

Is there any instruction that can activate the serial device connection ?

Regards,
Maman