HP V8.5 manual Data Transfer

5

T H E O R Y O F O P E R A T I O N

Signal	Signal	Active
Nhemmon-			Operation
	Name	Level
ic
IND1 -			Input lines for byte parallel
	Input data	High	data Must be accompanied
IND8
			by a PICLK
			Stobes a data byte present
PICLK	Parallel input	High	on IND1-IND8 into the
	clock		input bufffer. Minimum
			300nS pulse
			Low level means plotter is
			ready to receive next data
READY	Plotter ready	Low	byte or remote function.
			High level indicates plotter
			is busy and will not accept
			data or remote functions.

Table 5-2 Data Transfer

Note that the plotter goes busy after receiving each byte. The plotter goes busy for longer periods during the execution of remote functions, when the input buffer is full, or when an error occurs.

Table 5-3 shows the timing relationships for the remote functions. When the input buffer receives the number of bytes necessary to plot a full scan, a write cycle is automatically initiated, causing the buffer contents to be imaged on the medium.

5-4 V8.5eRev2.2.2002