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Parallel Interface
C-2 User’s Manual
Table C–1 Parallel interface signals
Pin
number
Return
pin
number
Signal
Compatible mode
Nibble mode
Direction Description
119Data Strobe
(DSTB)
Input
• Strobe pulse for reading data (Data 1
to Data 8). The printer reads data
when this signals is low.
• The pulse width must be 1 µs or more
at the printer’s receiving terminal.
Host Clock This signal is set high when the host
requests the reverse data transfer phase
(nibble mode).
2
3
4
5
6
7
8
9
20
21
22
23
24
25
26
27
Data 1
Data 2
Data 3
Data 4
Data 5
Data 6
Data 7
Data 8
Input
Input
Input
Input
Input
Input
Input
Input
• Data 1 to 8 signals correspond to
parallel data bits 1 to 8.
• Data 8 is the most significant bit, but
is not used in the 7-bit ASCII mode.
• All signals must go high at least 1 µs
before the falling edge of the D
ata
Strobe signal, and must stay high for at
least 1 µs after the rising edge.
10 28 A
cknowledge
(ACK)
Output
• Pulse signal indicating data receiption
completed (or data reception enabled)
status
• Issued when the printer switches from
offline to online
Printer Clock Reverse data transfer phase:
This signal goes high when data being
sent to the host is established.
Reverse idle phase:
This signal is set low then goes high to
interrupt the host, indicating that data is
available.
DL6400/6600 Book Page 2 Friday, July 31, 1998 11:42 AM