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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