Epson A794-D100 - Manual (Page 115)

A794 Owner’s Guide Chapter 6: Programming Information
March 1999 109
Select Bar Code Height
Sets the bar code height to n dots or n/203 inch (n/8 mm).
ASCII GS h n
Hexadecimal 1D 68 n
Decimal 29 104 n
Value of n Number of dots
Range of n 1-255
Default 216
Print Bar Code
Selects the bar code type and prints a bar code for the ASCII characters entered. If the
width of the bar code exceeds one line, the bar code is not printed.
There are two variations to this command. The first variation uses a NULL character to
terminate the string; the second uses a length byte at the beginning of the string to
compensate for the Code 128 bar code that can accept a NULL character as part of the
data. With the second variation the length of byte is specified at the beginning of the
string.
Bar codes can be aligned left, center, or right using the Align Positions
command (1B 61).
The check digit is calculated for UPC and JAN (EAN) codes if it is not sent from the host
computer. Six-character zero-suppressed UPC-E tags are generated from full 11 or 12
characters sent from the host computer according to standard UPC-E rules. Start/Stop
characters are added for Code 39 if they are not included.
Rotated barcodes set with small modules ( select bar code width command 1D 77 n ,
with n=1 or 2) and PDF417 barcodes in any orientation are printed at low speed, for
better readability.
First Variation Second Variation
ASCII GS k m d1…dk NUL GS k m n d1…dn
Hexadecimal 1D 6B m d1…dk NUL 1D 6B m n d1…dn
Decimal 29 107 m d1 dk NUL 29 107 m n d1…dn
(0 = End of command)
Exceptions
The command is only valid at the beginning of a line.
Illegal data cancels the command.