HP V8.5 manual Stepper motor, Interface timing and signals

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

Stepper motor

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The V8.5e uses a bipolar, two-phase stepper motor. The motor is micro-step driven, requiring 200 full steps for one rotation of the motor shaft. There are 32 micro-steps per full step. Thus the motor makes 6400 micro-steps for each rotation.

5.3INTERFACE

The data interface may be short line or, optionally, long line (see “Interface setup” in Chapter 3, Installation for details.) The plotter is compatible with either the Versatec Greensheet or (optionally) the Centronics interface (see Appendix A). Table 5-1 shows the active level for the plotter status signals.

Signal	Signal	Active	Operation
Mnemonic	Name	Level
ONLIN	Online	Low	Low level indicates the plotter
			is powered on and online
			Idicates there is no paper in
NOPAP	No paper	High	the plotter, or the lid is not
			properly closed and latched.

Table 5-1 Status Signals

Interface timing and signals

The ready signal indicates the plotter’s readiness to accept data. When READY is low, the plotter can accept one byte of data. This byte must be accompanied by a PICLK (data strobe) pulse.

Table 5-2 shows the timing relationship for maximum data transfer.

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