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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]