Interfaces
8-17
Table 8-3 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. For the
Lexmark T630, T632, and T634, use the Parallel 1284-B Interface Card.
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 8-3: 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.
