It does not generate an error when the paper runs out, it would be interesting to get

GetStatus not implemented about node-thermal-printer HOT 2 CLOSED

Feeh03114 commented on September 26, 2024

GetStatus not implemented

from node-thermal-printer.

Comments (2)

racoononmoon commented on September 26, 2024

Following the EPSON Command Reference, the printer simply goes OFFLINE when paper is not present.

TM-T88VII:
Paper sensor status (n = 1, 49)
When the roll paper end sensor detects a paper-end, the printer goes offline and does not execute this command. Therefore, bits 2 and 3 of the paper sensor status do not transmit a paper-end status.
https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=124

you can implement different status queries checking the paper low status and cash drawer status separately.
the difference to the execute() function is that you don't destroy the socket connection immediately after sending data but first wait for some status bytes to receive from the printer.

call it in the app code like
let printerStatus = await printer.status();

e.g. in core.js add:

async status() {
    let paper = await this.Interface.status("PAPER");
    let drawer = await this.Interface.status("DRAWER");
    let prst = await this.Interface.status("PRINTER");
    return {paper, drawer, printer: prst};
  }

in network.js add:

async status(which) {

    let buffer;

    if (which == "PAPER"){
      buffer = Buffer.from([0x1D, 0x72, 0x01]);  //03 = paper low, 00 = paper OK
    }else if(which = "DRAWER") {
      buffer = Buffer.from([0x1D, 0x72, 0x02]); //00 = drawer open, 01 = drawer closed
    }else if(which = "PRINTER") {
      buffer = Buffer.from([0x10, 0x04, 0x02]);  //00 = drawer open, 01 = drawer closed
    }
    

    return new Promise((resolve, reject) => {
      let name = this.host + ":" + this.port;
      var printer = Net.connect(
        {
          host: this.host,
          port: this.port,
          timeout: 3000
        },
        function () {
          printer.write(buffer, null, function () {
          });
        }
      );
  
      printer.on('data', function (data) {
        resolve(data.toString("hex"));
        printer.destroy();
      });

      printer.on('error', function (error) {
        resolve("ERROR");
        printer.destroy();
      });
  
      printer.on('timeout', function () {
        resolve("OFFLINE");
        printer.destroy();
      });
    });
  }

from node-thermal-printer.