C.ITOH 8510A User Manual page 27

SIGNAL
FUNCTION
INPUT BUSY • This output signal is similar to the BUSY signal. When HIGH,
INPUT BUSY indicates that the printer is not ready to receive
data.
• INPUT BUSY becomes HIGH whenever DATA STB or BUSY
is activated.
- -
• INPUT BUSY becomes LOW when ACK is activated, either
simultaneously with ACK or immediately after.
+5VDC
• This is not a signal. This is a +5V DC power source to an outside
device.
• The maximum output amperage is 50 rnA.
10-8. Timing Charts
(1)
When data are being received
Tl ~T3
T4
T5
T6
DATA
DATA STB
BUSY LOW
INPUT
BUSY
ACK
I
II
I
II
I
II
II I
II
I T5
T4~~~I--~-----------------+~
MIN 1 fJ.S
MAX
400 ns
MAX 2
ms
5.5 fJ.S
Fig. 22 Timing Chart A
(2) When the DATA BUFFER is full
DATA
DATA STB
BUSY
INPUT
BUSY
ACK
T7
=
MAX 2
ms
T7
Detecting buffer full
Fig. 23 Timing Chart B
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