Chapter 9: Vertical Control Commands96Vertical Format Unit (VFU) Commands (ML) ML320 Std., ML321 Std. ML320 Turbo, ML321 Turbo ML520, ML521Function ASCII Dec HexSet Vertical FormatUnit (VFU)DC4 SP1...SP1 n... SP...SP ?20 32...32 n ...32...32 6314 20...20 n ...20...20 3FExecute VFU Vertical Tab VT n 11 n 1B nIn the MICROLINE Standard emulation, the electronic Vertical Format Unit lets you program upto 12 different sets of vertical tabs. You can load a maximum of 54 tab stops into one set ofchannels. The command DC4 SP...SP n ... SP...SP ? is used to set up the tabs. Then wheneverthe printer receives a VT code followed by a channel code, it will skip to the next tab stop inthat channel.To load in your selected tabs, follow the DC4 code with one SP code (decimal 32) for each lineto be skipped to advance down the point where you want the first tab stop. For example, toadvance down three lines, use DC4 SP SP SP. Then enter the value you wish to assign for thechannel code n, taken from the table below. Next add more SP codes equal to the number oflines to be skipped down to the next tab stop, followed by the next channel code value.Continue this process until you've entered all the stops you want (up to a maximum of 12) forthat channel. Add enough spaces at the end of the sequence so that the number of spaces inthe sequence equals the number of lines on your page. Follow this with the ? character(decimal 63).Once you've set up the channels, send the VT n command to execute a vertical tab to the nextstop in the channel code sequence specified by n.Table 66: ML VFU Commands —Usable Channel Codes for Parameter nASCII 1 2 3 4 5 6 7 8 9 : ; <Dec 49 50 51 52 53 54 55 56 57 58 59 60Vertical Position CommandsSkip Down Command (ML) ML320 Std., ML321 Std. ML320 Turbo, ML321 Turbo ML520, ML521Function ASCII Dec HexSkip Down Selected Number ofLinesESC VT Hn L n 27 11 Hn Ln 1B 0B Hn L nThe skip down command makes it easy to move rapidly down a page. This is a useful featurewhen you are creating headings or filling in forms. The variables H n L n represent a 2-digit ASCIInumber from 00 to 99 which allows you to skip up to 99 lines; a value of 00 for Hn L n in thecommand results in no line feed.Set Relative Vertical Position Command (Epson) ML390 Turbo, ML391 Turbo
