Oki B4500 - Page 98

43502101TH Rev.1 98 /
Oki Data CONFIDENTIAL
4) Signal Level
• MARK polarity : -3V to -15V (LOGIC = 1)
• SPACE polarity : +3V to +15V (LOGIC = 0)
5) Interface Circuit
a) Receiving Circuit
14C232 or equivalent
INPUT
OUTPUT
+3V
-3V
+9V
-9V
OUTPUT
45 ns 55 ns
14C232 or equivalent
INPUT
OUTPUT
+3V
-3V
INPUT
+12V
-12V
b) Sending Circuit
Note: The signal levels described above is for the case where 3K Ω x 15pF is connected to the
terminal.
6) Receive Margin
37% min. at all reception rates.
7) Communications Protocol
a) READY/BUSY protocol
b) X-ON/X-OFF protocol