Datamax-O'Neil APEX Series Programmer’s Manual - Manual (Page 16)

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Set Vertical Tab Height ESC T V n
This command sets the vertical tab length in dot lines. 0 ≤ n ≤ 255.
The default value of the vertical tab is 203 dot lines.
Example: The following escape sequence sets the vertical tab to ten millimeters. Each dot is 0.125mm so to fixed the vertical
distance of 10mm, the n parameter is 80 (10 / 0.125).
Escape Sequence: ESC T V P
Hexadecimal: 1B 54 56 50
Decimal: 27 84 86 80
Form Feed FF
This command advances the paper by the number of lines specified in the Set Form Feed length in dot lines (below).
A Carriage Return (CR) is also performed to place the current print position at the beginning of the next line.
Control Code: FF
Hexadecimal: 0C
Decimal
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Set Form Feed Length in Dot Lines ESC T F n1 n2
This command sets the Form Feed Length in Dot Lines. The total Form Feed distance is computed using the following formula:
(n2 * 256 + n1). 0 ≤ n1 ≤ 255. 0 ≤ n2 ≤ 255. The default value is 1030 dot lines.
Note that the height of the font in dot lines will be subtracted from the total dot lines specified in the command.
Example: For a font 23 dot lines high and with an Esc T V 200 (0xC8) command sent, the actual VT value will be 200 – 23 = 177
dots.
Bar Codes
The Datamax-O’Neil printer series print several barcode symbologies including Linear and 2D barcodes. The following
commands are used to print barcodes.
Print Bar Code ESC z t n h data CR LF
This command will print a barcode without human readable text. The following table describes the Bar Code command
structure.
Parameters:
t Barcode
1 Code 39
2 Code 128,UCC/EAN-128
3 Interleaved 2 of 5
4 UPC/EAN/JAN
5 Codabar
9 PDF417 *