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Table 8-2 shows all protocol timings in nanoseconds
Printer-to-Computer Communication (Advanced Status)
The printer has a standard IEEE 1284-B compliant connector and is an IEEE 1284-I
compliant device. The optional RS-232C Serial/Parallel 1284-C Interface Card has an
IEEE 1284-C compliant connector and is an IEEE 1284-I compliant device.
Your printer could be considered an IEEE 1284-II compliant device if the “C” to “B”
style connector converter were used. The printer exceeds the maximum allowable
circuit capacitance for Level II interfaces. Compliance with IEEE 1284-II may slow data
flow control time slightly; however, all minimum and maximum criteria set forth in IEEE
1284 documentation will be met.
The printer supports:
• Compatibility mode
• Nibble mode
• Byte mode
• ECP mode
Table 8-2: Fastbytes Timing Sequence
Time Name Minimum/Maximum
T1 Data setup to STROBE* low 400 min.
T2 STROBE* low to ACKNLG* low 0
T3 ACKNLG* low to STROBE* high 0
T4 STROBE* high to ACKNLG* high 0
T5 ACKNLG* high and BUSY low to STROBE* low 0
T6 ACKNLG* low to change data 50 min.
T7 STROBE* Timeout
Max based on Auto Strobe Timer
500 min.
T8 ACKNLG* width
Equal to Data Setup Time
400 min.
T9 ACKNLG* to BUSY Skew +/ - 20 max.
T10 STROBE* high time
Equal to Data Setup Time
400 min.