Quintin Balsdon Quintin Balsdon - 1 month ago 28
Android Question

Android POS Printer ESC/POS

So I have been writing an Android app for a Bluetooth Printer for a while and I have realised that this is actually the ESC/POS standard: http://nicholas.piasecki.name/blog/wp-content/uploads/2009/12/ESC-POS-Command-Guide.pdf

Now the document I am using for my printer is a limited subset of these commands and can be found here: https://dl.dropboxusercontent.com/u/88265006/%E4%BA%A7%E5%93%81/Printer's%20user%20manual/SP-MP-300-Technical%20Manual.pdf

private void initPrinter() {
byte[] init = new byte[2];
init[0] = 0x1B;
init[1] = 0x40;
mService.write(init);
}

private void printText(String message){
byte[] send;
try{
send = message.getBytes("UTF8");
}
catch(UnsupportedEncodingException e){
send = "Error".getBytes();
}
initPrinter();
mService.write(send);
}


I can connect to the printer, initialise it with an "ESC @" command and I can write with the above commands, but I cannot seem to get any of the "visual" effects in terms of ANY kind of barcode. This is my attempt for a 1D EAN13 code (0000000000000):

byte[] height = new byte[3];
height[0] = 0x1D;
height[1] = 0x68;
height[2] = (byte)30;
//height[3] = 0;

byte[] width = new byte[3];
width[0] = 0x1D;
width[1] = 0x77;
width[2] = (byte)3;

byte[] textPos = new byte[3];
textPos[0] = 0x1D;
textPos[1] = 0x48;
textPos[2] = (byte)2;

byte[] level = new byte[3];
level[0] = 0x1D;
level[1] = 0x51;
level[2] = (byte)32;

byte[] code = new byte[18];
code[0] = 0x1D;
code[1] = 0x6B;
code[2] = 0x02;
code[3] = 0x0D;
code[4] = 0x30;//1
code[5] = 0x30;//2
code[6] = 0x30;//3
code[7] = 0x30;//4
code[8] = 0x30;//5
code[9] = 0x30;//6
code[10] = 0x30;//7
code[11] = 0x30;//8
code[12] = 0x30;//9
code[13] = 0x30;//10
code[14] = 0x30;//11
code[15] = 0x30;//12
code[16] = 0x30;//13

code[17] = 0x00;//end
mService.write(height);
mService.write(width);
mService.write(textPos);
mService.write(level);
mService.write(code);


Where mService actually writes the data. The best output I get is 0█0█0█0█0█0█0█0█0█0█0█0█0█0█ - after sending the data many times in a row.

If I remove the final end byte after multiple sends I get 14 0's, and I have also tried adding an ending 0 to the height, width, textPosition and level arrays, with no affect.

I have also looked in the following places:
http://www.manualslib.com/manual/689542/Axiohm-A795.html?page=91

http://pyramidacceptors.com/phoenix-printer/esc-pos-command-set/

http://www.vbforums.com/showthread.php?754493-RESOLVED-Printing-Barcode-with-ESC-POS-on-Epson-Printers

http://www.manualslib.com/manual/753647/Axiohm-A630.html?page=51

https://www.sparkfun.com/datasheets/Components/General/Driver%20board.pdf

Where can I find a "ESC/POS" Epson Barcode Test Program?

Answer

Ok so it turns out that in ESC/POS the printer actually calculates some of the data for you. I should not have been putting the check byte (the last digit of the actual bar code) in the data I was sending to the print.

Of course it did not help that my documentation is missing all the <= signs. I ended up using this document for help: http://content.epson.de/fileadmin/content/files/RSD/downloads/escpos.pdf

I am still working on the QR Code printing but I am quite certain my problems are somewhat similar.