Signal

Return

 

 

 

pin

pin

Signal

Direction

Description

 

 

 

 

 

33

-

GND

-

Same as for pins 19-30

 

 

 

 

 

34

-

NC

-

Not used

 

 

 

 

 

35

-

+5 V

OUT

Pulled up to +5 V through

 

 

 

 

1 KΩ resistance

 

 

 

 

 

36

-

NC

-

Not used

 

 

 

 

 

Notes:

❑The column heading “Direction” refers to the direction of signal flow as viewed from the printer.

❑“Return pin” denotes the twisted-pair return pin to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side.

❑All interface conditions are based on TTL level. Both the rise and 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.

Timing chart

The figure below shows the timing chart for the parallel interface.

BUSY

ACKNLG

DATA

STROBE

0.5 μs (Min.)

0 μs (Min.)

5 μs (Typ.)

0 μs (Min.)

Transition time (both the rise and the fall) of every signal must be less than 0.2 μs.

Technical Specifications B-11