Olivetti PG L22 Special Service Manual page 92

4) Signal Level
• MARK polarity :
• SPACE polarity :
5) Interface Circuit
a) Receiving Circuit
b) Sending Circuit
Note: The signal levels described above is for the case where 3K ý 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
Y103920-3
-3V to -15V (LOGIC = 1)
+3V to +15V (LOGIC = 0)
14C232 or equivalent
INPUT
INPUT
14C232 or equivalent
INPUT
OUTPUT
45 ns
Service Manual
OUTPUT
+12V
+3V
-3V
-12V
OUTPUT
+9V
+3V
-3V
55 ns
-9V
92