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2.3 Choosing the Right Font

The various Code 39 fonts creates bar code symbols of different sizes and densities.

Most of the fonts use a 2.5:1 wide: narrow bar ratio. The Slim fonts use a 2:1 ratio for

narrower symbols and the Wide font uses a 3:1 ratio for wider symbols. Like any

TrueType or Type 1 font, the bar code fonts can be scaled to any size. Any of the

fonts formatted at 24 or 36 points will create bar codes that are 1/3 (8.5mm) or 1/2

(12.7mm) inches tall respectively.

Be sure to print samples of the desired string in a number of the fonts and check that

it can be scanned when printed on your particular printer. Since the fonts have

different wide bar to narrow bar ratios, and overall height to width ratios, the same

string formatted in different fonts will be different widths. Try different fonts to decide

which one works best in your situation.

From UNIX or DOS it is necessary to send PCL escape sequences as part of the

print data to select the desired bar code font. Example escape sequences are shown

below:

Code39QuarterInch-Regular : esc(9Yesc(s1p#v0s0b28676T

Code39HalfInch-Regular : esc (9Yesc(s1p#v0s0b28677T

Code39OneInch-Regular : esc(9Yesc(s1p#v0s0b28678T

Code39SmallLow-Regular : esc(9Yesc(s1p#v0s0b28679T

Code39SmallMedium-Regular : esc(9Yesc(s1p#v0s0b28680T

Code39SmallHigh-Regular : esc(9Yesc(s1p#v0s0b28681T

Code39Slim-Regular : esc(9Yesc(s1p#v0s0b28682T

Code39Wide-Regular : esc(9Yesc(s1p#v0s0b28683T

(# : point size 0.25 - 999.75)

Replace the hash (#) with the relevant point size. For example, to print a bar code

that is one inch (25.4 mm) high, substitute '#' with '72'. To print a bar code half and

inch (12.7 mm) high, use 36.

After printing a bar code it is necessary to select a different font in order to print

something besides more bar codes. The PCL command to select the default font is

"<esc>(3@". To select a font other than the default font, use the PCL escape

sequence show on the PCL font list. The "<esc>" shown is the ASCII escape

character. It is decimal 27, hexadecimal 1B, octal 33, or binary 00011011.