User guide
Technical Characteristics
PIN SIGNAL DIRECTION SIGNAL DESCRIPTION
10 From printer
ACKNOWLEDGE
Normally at 1; pulsed at 0 to indicate that the printer
has accepted the single character transmitted.
11 From printer BUSY
Normally at 0; logic level 1 indicates that the printer
cannot accept any characters, and is activated in the
following cases: during data transfer, buffer full, error
condition.
12 From printer PAPER EMPTY
Normally at 0; set at 1 if there is no paper.
This signal is asynchronous with respect to Strobe,
Busy and Acknowledge.
13 From printer ON LINE
Set at 1, indicates that the printer is selected
(READY)
Set at 0, indicates that the printer is OFF LINE.
The level of this signal can be changed using
command code ESC Q (printer deselection) in IBM
emulation.
14 To printer AUTOFEED XT
Significant ONLY for EPSON emulation.
At logic level 0, indicates that auto LF (CR = CR+LF)
is active.
16 --- LOGIC GROUND
Logic ground level (0 V)
18 From printer +5 V
19 - 3
0
--- SIGNAL GROUND
Twisted pair return lines.
31 To printer
INIT
A level 0 pulse of width greater than 10 ms (sent by
computer) resets the printer and clears the print buffer.
F-7