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Appendix C
ZyXEL PARALLEL PORT INTERFACE
Signal
pin
Signal name Description Direction
Adapter - Printer
1 -STROBE Strobe pulse →
2 DATA 0 Data signal: bit 0. ↔
3 DATA 1 Data signal: bit 1. ↔
4 DATA 2 Data signal: bit 2. ↔
5 DATA 3 Data signal: bit 3. ↔
6 DATA 4 Data signal: bit 4. ↔
7 DATA 5 Data signal: bit 5. ↔
8 DATA 6 Data signal: bit 6. ↔
9 DATA 7 Data signal: bit 7. ↔
10 -ACKNLG Acknowledge signal; data has been received
by the printer and the printer is ready to accept
further data.
←
11 BUSY Busy signal; printer is not ready to receive
data.
←
12 PE Paper end ←
13 SLCT Printer is in the selected state; printer is on-line. ←
14 -ATFD Auto-feed; paper is auto-fed by one line after
every printed line.
→
15 -ERROR Printer is in error state. ←
16 -INIT Resets printer to initial state. →
17 -SLCT IN Enables printer for data entry. →
18 GND Ground
19 --- Not connected
20 GND Ground
21 GND Ground
22 GND Ground
23 --- Not connected
24 GND Ground
25 GND Ground