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11-9. Input/Output Circuit Configuration
(1)
RS232C
Output
Input
Signals
FAULT
SD (CER)
RTS
DTR
Signals
RD
CTS
DSR
CD
Circuit
+5V
f
r--
~---'r-!
- 0
o
I
~I
L-
6 -- b -- 6
-J
-12V
OV
+12V
SN75150 or the equivalent
Circuit
r-----------,
I
I
0
I
,..
I
...,
:
I
L---!----r---
J
+5V
OV
SN74154 or the equivalent
Output level: Nominal
± 12V
2
Input level:
Max.
±15V
Min.
±
5V
Note: The circuit is protected against input signals (fail-safe operation).
The threshold voltage level is shown below:
+2.2V
+l.4V
o ______________
~----------~~----------
OFF
ON
OFF
(MARK)
(SPACE)
(MARK)
-32-
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