Compatible Mode - Dascom 1500 User Manual

Interfaces

Compatible mode

Pin No. Signal name
1 nSTROBE
2–9 Data 0 to 7
10 nACK
11 BUSY
12 Paper Empty
(PE)
13 Select (SLCT)
14 nAUTO-
FEED
31 nINIT
32 nERROR
36 nSELECT IN
Direction Description
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.
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.
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.
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.
Output This signal is high when the printer is out
of paper.
Output This signal is high when the printer is
online.
Input Not used
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.
This signal is low when the printer is
offline, paper is out, or when there is a
printer error.
Input Not used
Parallel interface
B-3