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CBM-910 User’s Manual
CITIZEN 26/47
6.4 Electrical Characteristics
(1) RS-232C I/O Signals (RD / TD / DTR)
• Input (RD / TD) Mark = (-8V): stop bit
Space = (+8V): start bit
• Output (DTR) Mark = (-8V): for Busy
Space = (+8V): for Ready
(2) TTL Circuit
Input (RESET)
[HOST] [CBM-910]
Set to low when reset
[HC04 or equivalent]