5

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

 

Print mode

When the host asserts the PRINT mode signal, the plotter can generate ASCII characters. Table 5-5 shows the timing relationships for print mode signals.

Signal

Signal Name

Active

Operation

Mnemonic

Level

 

 

 

 

 

 

 

 

 

Selects either print or plot

PRINT

Print Mode

High

mode. When signal is high,

 

 

 

plotter is in print mode.

 

 

 

 

SPP

Simultaneous

Low

Not used

print/plot mode

 

 

 

 

 

 

 

Table 5-5. Mode signals

ASCII characters are produced as plot patterns on a 16 x 20 dot matrix through the use of a Character Generator ROM. When one complete print line of ASCII-coded data is received, the data is converted into plot patterns. Each character line is executed over 20 plot scans.

5-8

V8.5eRev2.2.2002