I want to print barcode 128 with lp2844 zebra, when I send comands via printer object like below code in vb6, nothing happend and the code will be printed like as a string. my question is how to send command to this printer and using internal barcode 128 printer.print N printer.print B1,5,0,1,1,7,40,B,"123456" printer.print P1

SOURCE: Enabling NCR 7875 flatbed scanner to read Code 128 barcodes

On a 7876, you need to scan the sequence “17130” is to add 128 tag readability. Not too sure if the 7875 is the same.

SOURCE: Code 128 Barcode Problem

Hello paul blando. I think I can help you here. First, are you sure your barcodes with asterisks are Code128 like the others? Generally a Code128 barcode will look like: "(1234) 567890 (01) 123456" and wouldn't really use asterisks at all. However, I know that it is standard practice for people who make their own Code39 barcodes to start and end the code with an asterisk to denote a start/stop action. Could they be Code39? They would look like: "*123456789*". If this is the case, then I have the manual for the P370/P470 on my company's site here. Take a look at the Code39 Chapter and make sure to print and scan the pages to disable the check-digit transmittal. If that doesn't do the trick, then try the "recall defaults" or "reset to defaults" barcode to reset the scanner to it's initial defaults. That should put it on track. If you still have trouble, please feel free to send me a message or email me. I hope this helps. Good luck!

SOURCE: I have Zebra LP2844 printer

To send text to printer in dos command you should first install a driver from
www.seagullscientific.com
then in the properties you can use send file to printer.
To send the files from command :
Check if the program ssdal.exe has been correctly installed.
to have help use ssdel help send at dos prompt
to send the file
ssdal send filename printername should do the trick
hope it helps