Lexmark X644e User Guide
Interfaces
8-13
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.
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.
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.