Lexmark MC2325 Printer Languages and Interfaces Technical Reference - Page 136

Standard protocol data transfer sequence, Minimum/Maximum

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Printer interfaces 136 Standard protocol data transfer sequence The following illustration shows the typical data transfer sequence on the parallel interface. For more information on typical parallel interface timings, see "Typical parallel interface timings" on page 136. DATA1-8 AB C STROBE* G D F BUSY E ACK* The following table shows all protocol timings in nanoseconds. Time Name A Data setup to STROBE* low B STROBE* width C Data hold after STROBE* D STROBE* low to BUSY high E ACKNLG* low until ACKNLG* high F ACKNLG* high to BUSY low1 G BUSY low and ACKNLG* high to STROBE* low 1 Relationship of ACKNLG* and BUSY is not consistent Minimum/Maximum 500 min. 500 min. 500 min. 500 max. 500 min. N/A 500 min. Fastbytes protocol data transfer sequence The printer is equipped with Fastbytes protocol, which is an enhanced parallel interface protocol. Fastbytes protocol may give a faster data transfer time on some personal computers and operating systems. Fastbytes protocol is the printer default. If there is data transmission problems between the personal computer and the printer, then change the parallel protocol to Standard. This protocol causes the printer to operate in IEEE-compliant compatibility mode.

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Standard protocol data transfer sequence
The following illustration shows the typical data transfer sequence on the parallel interface. For more
information on typical parallel interface timings, see
“Typical parallel interface timings” on page
136
.
DATA1-8
STROBE*
BUSY
ACK*
A
B
C
D
E
F
G
The following table shows all protocol timings in nanoseconds.
Time
Name
Minimum/Maximum
A
Data setup to STROBE* low
500 min.
B
STROBE* width
500 min.
C
Data hold after STROBE*
500 min.
D
STROBE* low to BUSY high
500 max.
E
ACKNLG* low until ACKNLG* high
500 min.
F
ACKNLG* high to BUSY low
1
N/A
G
BUSY low and ACKNLG* high to STROBE* low
500 min.
1
Relationship of ACKNLG* and BUSY is not consistent
Fastbytes protocol data transfer sequence
The printer is equipped with
Fastbytes
protocol, which is an enhanced parallel interface protocol. Fastbytes
protocol may give a faster data transfer time on some personal computers and operating systems. Fastbytes
protocol is the printer default.
If there is data transmission problems between the personal computer and the printer, then change the parallel
protocol to Standard. This protocol causes the printer to operate in IEEE-compliant compatibility mode.
Printer interfaces
136