Computer Interface
4-3
Parallel Interface
Communication Modes
The printer provides high-speed data transmission on a parallel interface. You can select the parallel
interface communication mode from the operation panel. To change the communication mode, refer
to Changing Parallel Interface Mode on page 2-24.
NOTE: Use a parallel interface cable that complies with the IEEE 1284 standard.
You can choose from four communication modes:
Interface Signals
Table shows the connector pins and corresponding input and output signals of the parallel interface.
Explanation of each signal is also given in the table.
The description in [ ] indicates signal names in Auto mode and Nibble (high) mode (IEEE
1284-compliant). In Auto and Nibble modes, these signals are bidirectional.
Communication Mode Reception Transmission
Auto (default) High-speed/ECP Nibble/ECP
Nibble High-speed Nibble
High-speed High-speed —
Normal Normal —
Pin In or out Signal Description
1 In Strobe* [nStrobe] A negative-going-strobe pulse causes the printer to
read and latch the data on the Data 0 [1] to Data 7
[8] signal lines.
2 In Data 0 [Data 1] These eight signals form one byte of data sent from
a host computer to the printer. Data 7 [8] is the most
significant bit.
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] This negative-going pulse acknowledges the
previous character received.
11 Out Busy [Busy] When this signal is high, the printer is busy. When it
is low, the printer is able to receive more data.
12 Out Paper Empty [PError] This signal goes high when the printer runs out of
paper. **
13 Out Online (Select) [Select] This signal goes high when the printer is online and
low when the printer is offline. The signal goes low
when you press [GO] to make the printer go off
line. **
14 In — [nAutoFd] Ignored
15 — — Not used
16 — 0 V DC
17 — Chassis Ground
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