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-
- -
,
,
Pin No.
Signal
Direction
-.:
~
Explanation
."
.. r.
I
12
STATUS
Output
• It responds with this signal, checking whether there is print
ing paper or not and checking the condition of the printer
mechanism in response to status demands from the host
machine.
• * It is negative logic and this signal is at a high level during
correct conditions.
• *This signal is at a low level when there is no printing paper
or when trou ble with the rnechan ism is caused.
-
13-25
GND
• Logic G N 0 level
(Note) Signals are all at TTL level.
*(Note) These specifications may be different from former ones.
3. Interface circu it
a)
RD1-RD8
line
(Interface card side)
(Printer side)
+5V
SN7416
220n
(Equivalent)
SN74LS125
56n
(Equivalent)
1
390,,1 OOPF
1
c)
RDA, STATUS line
(Interface card side)
(Printer side)
+5V
+5V
SN74LS125A
~
220n
1Kn
(Equ ivalent)
SN7406
(Equivalent)
b)
I RT, R
DP
line
(I nterface card side)
(Printer side)
+5V
SN7416
~ 220n
SN75189
(Equivalent) f
56n
(Equivalent)
470n
390"1100PF
1
22
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