User guide

Interfaces Parallel interface
B-3
Compatible mode
Pin No. Signal name Direction Description
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 most significant bit;
however, this pin is 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