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

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

Stepper motor

5

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	Operation
	Mnemonic	Name	Level

	ONLIN	Online	Low	Low level indicates the plotter
	ONLIN	Online	Low	is powered on and online
				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.

V8.5eRev2.2.2002

5 -3

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Contents V8.5 Thermal Plotter Haftungsausschluss Copyright NoticeTrademarks DisclaimerPage Iii V8.5eRev2.2.2002 Limitation of Liability Contents Operation Appendices MaintenanceV8.5eRev2.2.2002 Media Description General DescriptionAbout this Manual Operation FunctionalSpecification S Media Interface TransportElectrical Environmental PhysicalUnpacking InstallationMounting and Positioning Media Installation Interface SetupInstalling rolled paper Back Panel Roll paper and film path Opening the plotter Lid Installing fan-fold paper Installing rolled film Spindle blocks E R a T I O N Power Supply PrecautionsControl panel Using the Control PanelControl panel button functions Rev2.2.2002 Changing function settings Control Panel Functions and SettingsContrast Default SettingsTestplot Speed Media Scaling Form feed length Emulation vertical resolutionMenusettingsareF2, F4, F8, tF,PF E R a T I O N Bytes per scan Menusettingsare b1, b2, g1, g2, g3, and g4Grayscale media table number Setup headers for programming the V8.5eSA=4B E R a T I O N Byte Line feed Error Messages Fehlermeldungen Introduction Plotter Functions and FeaturesPower supplies T I O N Interface Interface timing and signalsStepper motor Data Transfer Clear Minimum data rates Data ratesScan width VerticalresolutionMode signals Print modeThermal Printhead Automatic Head Temperature FeedbackMedia Sensors Film mediaMaintenance I N T E N a N C E Maintenance GuidelinesRegular Maintenance Cleaning the thermal printhead Cleaningtheplatenroller Replacing the fuse Troubleshooting Plotter does not plot ProblemsPlotwithverticalwhitestripes Plot has vertical white stripesPlot is blotchy or faded Plot contrast is weak Plothasblackverticallines SolutionPaper is wrinkling or tearing along one edge Plot is wrong lengthCan’t make changes to control panel settings Plotter has no powerPlot output speed is erratic Bloomingplot Form feed does not stop at top-of-form marks Form feed stops before desired lengthSkewedplot Plot is skewed or unreadableR R a N T Y R R a N T Y C I I T a B L E S Interface Connector PIN Assignment TableB-2. Centronicscablepinoutsstraightthrough Centronics Interface Board Centronics Interface Board Centronics Interface Board