Oki ML1120, Technical Reference Manual

Page: 29 / 254

Technical Reference Guide – Interface specifications > 29
E
LECTRICAL CHARACTERISTICS
Signal levels
RS-232C interface signal levels are as specified below, and meet
the EIA Standard RS-232C:
–15 to –3 V: LOW = OFF = LOGIC “1”
+15 to + 3 V: HIGH = ON = LOGIC “0”
Line driver
NOTE
Line receiver
NOTE
Equivalent to HIN202
INPUT
OUTPUT
OUTPUT
+9V
+3V
-3V
-9V
+5V
400
The above figures are the standard values for a load of
3 Kohm, 15 pF and a driver source level of ±9 V.
Equivalent to HIN202
INPUT
+12V
-12V
-3V
+3V
INPUT
OUTPUT
5 K
If the power on the input side is OFF, the output of the
receiver becomes high (+2.4 V or more) at TTL level.