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

5

Stepper motor

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.

 

 

 

 

 

 

 

 

Table5-1StatusSignals

Interfacetimingandsignals

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