Android Question Epson (ESC/POS) commands - Printer

[Nikan99]

Hello,
I have an usb printer (i don't know it's model neither it's codepage, i can not print it and i don't have any documentation) and i have made the connection with my app. I can send POS/ESC commands and print my result but if i try to send a POS/ESC command using an "n" 2 digit number, the printer receive the first digit as the n and the second digit will be added to my string.
I have an example and its result.

For i=0 To 2
Dim output As String =ESC & 3 & 12 & "test" & newline
Dim buf() As Byte = output.GetBytes("UTF8")
req.Queue(buf,buf.Length)
Next

The result we want to print is:
test
\
12 lines distance
/
test


BUT it will print me:

2test
} 1 line distance
2test

Do you have anything in mind?

 

[aeric]

Try dumping the test print to see the configuration by press and hold the paper feed button while turning the printer on.

 

[agraham]

n needs to be s single byte in the range 0 to 255. Your "12" is output as two characters. Try
Dim output As String =ESC & 3 & Chr(12) & "test" & newline

Dim buf() As Byte = output.GetBytes("UTF8")
The codepage is normally "IBM437" for ESC/POS printers, though "UTF8" will work if you only want to print characters for the lower ASCII character range of 0 to 127.

Also check this out. It is set up for Bluetooth but you only need to change WriteBytes and WriteString2 in the EscPosPrinter module to write to your USB

Bluetooth ESC/POS Printer Class

For the last couple of weeks I have been playing with an 80mm Bluetooth ESC/POS thermal printer I bought off eBay, new and delivered, for the ludicrously cheap price of £20. While the print quality, particularly of images with large areas of black (they are gray due to power supply or thermal...

www.b4x.com

 

[Nikan99]

Try dumping the test print to see the configuration by press and hold the paper feed button while turning the printer on.

Unfortunatelly I have tried that but it prints something like a test page. I have no documentation for the printer.

 

[aeric]

Unfortunatelly I have tried that but it prints something like a test page. I have no documentation for the printer.

Yes, the Test page should provide you information such as Printer Model and Supported Encoding. You can use the Printer Model to search documentation online.