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48
Parallel interface signals
Signal name In/Out
Description
DSTB
In
DSTB is a negative going pulse which is used to transfer
incoming data from the host into the printer.
The pulse duration must be minimum of 1 microsecond. The
relationship of the leading and trailing edge of the DSTB signal
with the leading and trailing edge of the input data signals must
be as shown in the interface timing diagram.
DATA1~8
In
Data bits contain ASCII character data information.
Data bit levels are positive true logic.
ACK
Out
The ACK signal is a negative-going signal which indicates, by
the rising edge, that the printer is no longer busy.
The falling edge of the ACK may occur any time during BUSY
and the rising edge may occur coincident with the falling edge
of BUSY or up to 5 microseconds later. The ACK pulse must
be a minimum of 5 microseconds wide.
PAPER OUT
Out
The PAPER OUT signal is a positive-going pulse which
(PE)
indicates that the Printer is out of paper.
If not active, this signal must be terminated low.
BUSY
Out
The BUSY signal is a positive going pulse which indicates that
the printer is out of paper or printer is not ready to receive data.
If not active, this signal must be terminated low.
BUSY
Out
The BUSY signal is the logical inverse ofBUSY.
FAULT
Out
The FAULT line is a negative going signal that indicates there
is a fault condition present; i.e., paper out, logic fault, offiine
condition, or other mechanical fault.
Timing Diagram
•
DATA input timing diagram
Tl
DATAl-8
T2
1 -
T3
DSTB
-
BUSY
BUSY
ACK
T4
T6
TS: 5 (µ,s)min.
T6: 0.6µ,s max.
I
I
L
- -f--
TS
T7
2. 75::s;;n (µ,s)
Q::s;;T2 (µ,s)
1.stet::s;;T3 (µ,s)
190<T4 (µ,s)
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