5
T H E O R Y O F O P E R A T I O N
5 -3
V8.5e Rev 2.2.2002
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.
5.3 INTERFACE
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.
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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