All interface conditions are based on TTL level. Both the rise and the fall times of each signal must be less than 0.2 microseconds.

Data transfer must be carried out by observing the ACKNLG or BUSY signal. Data transfer to this printer can be carried out only after receipt of the ACKNLG signal or when the level of the BUSY signal is LOW.

Printing enabled/disabled signals and control conditions

The following table shows the relationship between printing being enabled or disabled, the on line/off line status, and the receipt of the data on/off control characters, DC1 or DC3.

 

 

 

 

 

 

 

 

 

 

ON LINE

SLCT IN

DClIDC3

ERROR

BUSY

ACKNLG

Printing

 

tt$icator

 

(Data

 

 

 

 

(Disabled/

 

 

 

on/off

 

 

 

 

enabled)

 

 

 

control)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

on line

High

DC1

High

High/Low

Pulsed

Enabled

 

 

 

Recv’d

 

 

ea. char.

 

 

 

 

 

 

 

 

 

 

on line

High

DC3

High

High/Low

Pulsed

Disabled’

 

 

 

Recv’d

 

 

ea. char.

 

 

 

 

 

 

 

 

 

 

off line

High/Low

DC1 /DC3

Low

High

Not

Disabled

 

 

(no effect)

(no effect)

 

 

generated

 

 

 

 

 

 

 

 

 

 

*While printing is disabled, character data is being received and acknowledged so that the printer can look for another DC1 character, which would allow it to resume printing.

Technical Specifications

A-11