8.BCD DATA OUTPUT
(
TD-2403
)
60
8-2. Logic Switching
The logic Switching function is used to switch between the signal output logics, positive
logic and negative logic. Pin 28 is used for this purpose.
When COM and pin 28 are left open, the negative logic is used. When COM and pin 28
are short-circuited, the positive logic is used.
8-3. Equivalent Circuit
・
Output
The signal output circuit employs the TTL open collector output
TD-240A
Inside
Vcc
+5V
COM
Vext
Vceo=30V(max)
Ic =50mA (max)
●
Internal transistor status
Output data
Negative
Positive
0
OFF
ON
1
ON
OFF
●
Output pin level
Output data
Negative
Positive
0
H
L
1
L
H
Through logic switching
(
pin 28
)
outside
Содержание TD-240A
Страница 1: ...TD 240A OPERATION MANUAL TEAC INSTRUMENTS CORPORATION Rev 1 35 2005 JUL ...
Страница 89: ...13 SELF CHECK FUNCTION AND INITIALIZATION 80 Self check Visual Check Sequence ...
Страница 91: ...13 SELF CHECK FUNCTION AND INITIALIZATION 82 Initialization Sequence ...
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