TallyGenicom 2440 User Guide

B-3

Compatible mode

1

nSTROBE

Input

This signal is a strobe pulse for reading 
data (Data 0 to 7). The printer reads data 
when this signal is low. The pulse width 
must be 1 µs or more at the receiving ter-
minal.

2–9

Data 0 to 7

Input

Data 8 (pin 9) is the mostsignificant bit; 
however, this pinis not used in 7-bit 
ASCII communications.Logical 1 signals 
must go high at least 1 µs before the fall-
ing edge of the Data Strobe signal and 
must stay high for at least 1 µs after the 
rising edge.

10

nACK

Output

This pulse signal indicates that the printer 
has received data and is ready to accept 
the next set of data.This signal is also sent 
when the printer is switched from offline 
to online.

11

BUSY

Output

Data cannot be received when this signal 
is high. This signal is high during data 
entry, when the printer is offline, when 
the buffer is full, or when an error occurs.

12

Paper Empty 
(PE)

Output

This signal is high when the printer is out 
of paper.

13

Select (SLCT)

Output

This signal is high when the printer is 
online.

14

nAUTO-
FEED

Input

Not used

31

nINIT

Input

If this signal is low for more than 50 µs, 
the printer is reset to the initial condition 
and is placed online. If the received data 
remains in the buffer, the printer contin-
ues to print until the buffer becomes 
empty.

32

nERROR

This signal is low when the printer is 
offline, paper is out, or when there is a 
printer error.

36

nSELECT IN

Input

Not used