Epson ColorWorks C7500 Technical Reference Guide - Page 134

Specifying the 2D symbol data See the following description to specify the 2D symbol data. PDF417/MicroPDF417  Calculated automatically when the digit number and the line number are 0.  To specify other number than 0, make sure the multiplication of the digit number and the line number is under 928. QRCode  It is changed automatically to the appropriate version. Micro QRCode  The size is automatically determined. MaxiCode  Specify the special character as the following format. Control Character Hexadecimal SHIFT 0x7B, 0x53 CODE B 0x7B, 0x42 CODE C 0x7B, 0x43 FNC1 0x7B, 0x31 FNC2 0x7B, 0x32 FNC3 0x7B, 0x33 FNC4 0x7B, 0x34 DataMatrix  When data are '{', if the following does not apply to the data immediately after, an error occurs. Control Character ASCII FNC1 {1 '{' {{ GS1 DataBar Stacked /GS1 DataBar Stacked Omnidirectional  Do not specify the application identifier '01' for the head of the data.  A check digit need not to be attached to the data.  When printing a 2D symbol with a composite symbol, delimit the data that specify a composite symbol and 2D symbol with "\|" or "|\". Specify the data in order of a composite symbol and 2D symbol. 134