5

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

Signal

Signal

Active

 

Nhemmon-

Operation

Name

Level

ic

 

 

 

 

 

 

 

 

IND1 -

 

 

Input lines for byte parallel

Input data

High

data Must be accompanied

IND8

 

 

by a PICLK

 

 

 

 

 

 

 

 

 

 

Stobes a data byte present

PICLK

Parallel input

High

on IND1-IND8 into the

clock

input bufffer. Minimum

 

 

 

 

 

300nS pulse

 

 

 

 

 

 

 

Low level means plotter is

 

 

 

ready to receive next data

READY

Plotter ready

Low

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.

Table 5-3 shows the timing relationships for the remote functions. When the input buffer receives the number of bytes necessary to plot a full scan, a write cycle is automatically initiated, causing the buffer contents to be imaged on the medium.

5-4

V8.5eRev2.2.2002

Page 48
Image 48
HP V8.5 manual Data Transfer