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Appendix A
Parallel Interface
Parallel Interface
Parallel Interface Specification (IEEE 1284)
Parallel Protocol
The Series 80PLUS Printer uses a standard PC-compatible IEEE 1284 parallel interface. The
following illustration shows the timing diagram for the interface protocol in compatibility
mode.
Busy
Acknowledge (L) Pin 10
Strobe
Data (Pins 9-2)
Th = Ts = 0.5us min.
Figure 4 Timing diagram in compatibility mode
1. The host places its data on the data lines.
2. The host strobes the data into the printer latch using Strobe (L).
3. The printer goes Busy (H) until the printer is ready to receive the next byte.
4. The printer acknowledges receipt of the data byte by Pulsing ACK (L).
5. The printer removes Bush (H) to allow continuation of data flow.
NOTE: Definition and timing of the parallel IEEE 1284 interface is beyond the scope of this
manual. For a complete description of this interface, refer to the IEEE 1284 Specification.
This table describes the pin settings for the parallel interface.
Pin 1
Pins 2-9
Pin 10
Pin 11
Pin 12
Pin 13
Pin 14
Pin 15
Pin 16
Pin 17
Pins 18-25
Page 114
PcOS Series 80PLUS
Ts 0.5us Th
Strobe
Clock data to printer
D0-D7
Data
ACK(L)
Printer accepted data
Busy
Printer busy
PE
Paper out/status
SLCT
Printer selected
AUTOFD
Auto feed paper
ERR(L)
Printer error
INIT(L)
Initialize the printer
SLIN
Select printer
GND
Ground
Rev B 4/13/99
Programmer's Guide
0.5us
Host to Printer
Host to Printer
Printer to Host
Printer to Host
Printer to Host
Printer to Host
Host to Printer
Printer to Host
Host to Printer
Host to Printer
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