
192 Servicing Personal Computers
Table
5.1
Pin assignment and typical nomenclature used for a parallel interface - continued
Signal pin no.
13
14
15
16
17
18
31
Return pin no.
—
—
—
—
—
Signal
SLCT
AUTO-
FEED XT
n.c.
0 V
GND
n.c.
INIT
Function
32
33
34
35
36
ERROR
GND
n.c.
ON
SLCT IN
Output, active
high.
Signals that the printer is in
the selected state
When this input is low, the paper is automatically
fed one line after printing
Logical common
Chassis ground (normally isolated from the
logical common)
When this input is low, the printer controller is
reset to its initial state and the print buffer is
cleared.
A pulse of >50/u,s is require