Printronix P9000 Series manual Ascii, Nul Soh Stx Etx Eot Enq Ack Bel

Table 5-5. DVFU Channel Instruction

	ASCII						Data Bits					Channel
Hex	Dec	Code	PI	8	7	6	5	4	3	2	1
00	0	NUL	1	X	X	X	0	0	0	0	0	1
01	1	SOH	1	X	X	X	0	0	0	0	1	2
02	2	STX	1	X	X	X	0	0	0	1	0	3
03	3	ETX	1	X	X	X	0	0	0	1	1	4
04	4	EOT	1	X	X	X	0	0	1	0	0	5
05	5	ENQ	1	X	X	X	0	0	1	0	1	6
06	6	ACK	1	X	X	X	0	0	1	1	0	7
07	7	BEL	1	X	X	X	0	0	1	1	1	8
08	8	BS	1	X	X	X 0 1 0 0 0						9
09	9	HT	1	X	X	X 0 1 0 0 1						10
0A	10	LF	1	X	X	X 0 1 0 1 0						11
0B	11	VT	1	X	X	X 0 1 0 1 1						12
X = Undefined, 0 or 1						1 = High						0 = Low

3.A second start load code is received, resulting in reinitialization of the DVFU. This allows the host data to be restarted.

4.The first byte sent after the start load does not specify top-of-form.

The DVFU data is ignored if the DVFU has not been selected from the control panel. DeseF lecting the DVFU returns the forms length to the previously set value and the current print position becomes the top-of-form (TOF).

Relative Line Slewing

Another method of moving paper using the PI line results in vertical slews of a specified numF ber of lines within the form relative to the current print line (rather than slewing to a specific line). For this to occur, three criteria must be met:

1.PI line must be set high;

2.Data bit 5 must be 1 (set); and

3.The DVFU must be the selected Vertical Format Unit.

The Slew Relative configuration and the status of data bits 1-4 determine the number of lines slewed as described in Table 5-6. (Note that the state of data bit 5 is the difference between line slewing and using the interface lines as DVFU channel codes.) As long as the DVFU is selected, this type of vertical paper motion will occur regardless of whether the DVFU memory is loaded or not.

If the Double High for One Line attribute is active, n + 1 lines will be slewed rather than n lines.

Vertical Format Units 5-9