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5) Interface circuit
a) Receiving circuit
75189 or equivalent
OUTPUT
INPUT
+12V
+3V
-3V
-12V
INPUT
b) Sending circuit
75188 or equivalent
OUTPUT
INPUT
OUTPUT
+3V
-3V
55ns
45ns
+9V
-9V
Note: The above signal level is for the case where 3KΩ x 15pF is being connected to the
terminal.
6) Communications protocol
a) READY/BUSY protocol
b) X-ON/X-OFF protocol
B-2