70Chapter 4^G Command TerminatorFourth Command:^V0505000^T0250^IBARC,C128,B,Vert Right^G^-^V0505000 Causes barcode to print vertical right with a heightof 0.5 inches.^T0250 Tabs the start of the barcode 2.5 inches from theleft margin.^IBARC,C128,Turns ON Barcode Mode and selects Code 128barcode.B, Prints the character translation below the barcode.Vertical RightData to be encoded as a Code 128 barcode andprinted below the barcode as Draft 10 CPIcharacters.^G Command TerminatorDark/Light Bar RatiosThe default widths of the light and dark bars that comprise each barcode styleare determined by the ratios given in Table 3. These ratios are read in pairs,with the first number of the first pair being the width of the narrowest bar in dotcolumns, and the second number of the first pair being the width of thenarrowest space in dot columns. The second pair of numbers in the ratio referto the next wider bar and space, respectively.For example, Code 39 has the ratio 1:1:3:3 which means:• The narrow bars and spaces are each one dot column wide.• The wide bars and spaces are each three dot columns wide.If a barcode style has more than two pairs of numbers, it has more than twobar/space widths. For example, Code 128 has the ratio 1:1:2:2:3:3:4:4. Sincethis is comprised of four pairs of numbers, four different widths of bars andsapces are used in this particular barcode:• The narrowest bars and spaces are one dot column wide.• The next wider bars and spaces are two dot columns wide.• The next wider bars and spaces are three dot columns wide.• The widest bars and spaces are four dot columns wide.Ratio numbers may range in value from 0 to F, hexadecimal. That is, a ratiovalue of A corresponds to decimal 10 and F corresponds to decimal 15.NOTE: The printer does not verify that a given ratio sequence adheres to thestandard barcode specification. Many barcode ratios will cause thebarcode to fall outside the specifications, resulting in unreadability.
