C.1. Parallel Interface
C-2
Interface Signals
The pins of the parallel interface connector carry the signals listed in Table
C.1
. Asterisks in the table indi-
cate signals that are active low. The table also indicates whether each signal is incoming or outgoing with
respect to the printer.
[
]: Signal names in the Nibble (high) mode (IEEE 1284). In the Nibble (high) mode, these signals are bi-directional.
Table C.1. Parallel Connector Pin Assignments
Pin
In/out
Description
1
In
Strobe* [nStrobe]
2
In
Data 0 [Data 1]
3
In
Data 1 [Data 2]
4
In
Data 2 [Data 3]
5
In
Data 3 [Data 4]
6
In
Data 4 [Data 5]
7
In
Data 5 [Data 6]
8
In
Data 6 [Data 7]
9
In
Data 7 [Data 8]
10
Out
Acknowledge* [nAck]
11
Out
Busy [Busy]
12
Out
Paper Empty [PError]
13
Out
On-Line (Select) [Select]
14
In
Ignored [nAutoFd]
15
—
Not connected
16
—
0V DC
17
—
Chassis GND
18
—
+5V DC
19
—
Ground return
20
—
Ground return
21
—
Ground return
22
—
Ground return
23
—
Ground return
24
—
Ground return
25
—
Ground return
26
—
Ground return
27
—
Ground return
28
—
Ground return
29
—
Ground return
30
—
Ground return
31
In
Reset [nInit]
32
Out
Error*, returns error status if FRPO O2=2 [nFault]
33
—
—
34
—
Not connected
35
Out
Power Ready
36
In
Select In [NSelectIn]
