Datamax 7A300007 Rev. 2 Bar Codes, Set Vertical Tab Height ESC T V n, Form Feed, Print Bar Code

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 12

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 *
	10