Lexmark Printer User Manual page 353

Table 8-2 shows all protocol timings in nanoseconds.
Table 8-2: Typical Parallel Interface Timings
Time
A
B
C
D
E
F
G
1
Relationship of ACKNLG* and BUSY is not consistent
Fastbytes Protocol Data Transfer Sequence
Your printer is equipped with Fastbytes protocol, which is an enhanced parallel
interface protocol. Fastbytes protocol may give you a faster data transfer time on some
personal computers and operating systems. Fastbytes protocol is the printer default.
If you have data transmission problems between your personal computer and the
printer, change the parallel protocol to Standard. This causes the printer to operate in
IEEE-compliant compatibility mode.
The following illustration shows the typical timing sequence.
Name
Data setup to STROBE* low
STROBE* width
Data hold after STROBE*
STROBE* low to BUSY high
ACKNLG* low until ACKNLG* high
ACKNLG* high to BUSY low
BUSY low and ACKNLG* high to STROBE* low
DATA 1-8
STROBE*
ACK*
BUSY
8-16
1
Interfaces
Minimum/Maximum
500 min.
500 min.
500 min.
500 max.
500 min.
—
500 min.