We have 2 set of zpl streams being passed to a printer. We have a data matrix barcode with hexadeciaml value and we have not used any encoding to print same but we are sending another set of ZPL streams to printer with ^CI28 encoding but not setting back to ^CI0
Few/One of the labels got printed successfully and barcodes are scannable but post few iterations, the barcodes are not scanabledue to ^CI0 encoding missing for the data matrix barcode.
We did make the change as per approach #2 and it worked but we would like to understand that

#a. is the 2nd ZPL stream (2nd ^XA -.. ^XZ) not expected to set ^CI0 at the end so that subsequent ZPL streams sent to printers are not impacted?
#b. is it required to have ^CI0 before the data matrix barcode call and if it has hexa decimal value? I could not find this approach in ZPL guide

#1 Approach
^XA
^FO775,275
^BXN,5,200,,,,*
^FH^FD_44_45^FS
^XZ
^XA
^LH0,1850
^CI28
^FO0,0^A0N,50,50^FH^FD ^FS
^FO120,60^A0N,50,50^FH^FDABC ^FS
^XZ

#2 Approach
^XA
^FO775,275
^CI0
^BXN,5,200,,,,*
^FH^FD_44_45^FS
^XZ
^XA
^LH0,1850
^CI28
^FO0,0^A0N,50,50^FH^FD ^FS
^FO120,60^A0N,50,50^FH^FDABC ^FS
^XZ

#3 Approach
^XA
^FO775,275
^BXN,5,200,,,,*
^FH^FD_44_45^FS
^XZ
^XA
^LH0,1850
^CI28
^FO0,0^A0N,50,50^FH^FD ^FS
^FO120,60^A0N,50,50^FH^FDABC ^FS
^CI0
^XZ

Thank you.