iSys V8.5e Thermal Printer - Manual (Page 41)

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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.
Signal
Mnemonic
Signal
Name
Active
Level
Operation
ONLIN Online Low Low level indicates the plotter s powered on
and online
NOPAP No paper High Indicates there is no paper in 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.
Signal
Mnemonic
Signal
Name
Active
Level
Operation
IND1 -
IND8
Input data
High
Input lines for byte parallel data Must be
accompanied by a PICLK
PICLK Parallel input
Clock
High Stobes a data byte present on IND1-IND8 into
the input bufffer. Minimum 300nS pulse.
READY Plotter ready Low Low level means plotter is ready to receive next
data 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.