8.BCD DATA OUTPUT
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
F340A
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
Summary of Contents for F340A
Page 1: ...F340A DIGITAL INDICATOR 14 Feb 2012 Rev 1 38 OPERATION MANUAL...
Page 9: ...CONTENTS 15 7 General Specifications 90 15 8 Accessories 91 16 CONFORMITY TO EC DIRECTIVES 92...
Page 92: ...13 SELF CHECK FUNCTION AND INITIALIZATION 83 Self check Visual Check Sequence...
Page 94: ...13 SELF CHECK FUNCTION AND INITIALIZATION 85 Initialization Sequence...
