Citizen Systems Compact desk-top dot matrix printer CBM-910 Type II - Manual (Page 30)

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6. SERIAL INTERFACE
6.1 Specifications
(1) Synchronization: Asynchronous
(2) Baud rate
1200, 2400, 4800, 9600, 19200 Baud/sec (User selection)
(3) Word configuration
• Start bit: 1 bit
• Data bit: 7 bits or 8 bits (User selection)
• Parity bit: odd, even, no parity (User selection)
• Stop bit: 1 bit or more
(4) Signal polarity
RS-232C
• Mark = Logic “1” (
−3 V to −12V)
• Space = Logic “0” (+3 V to +12 V)
Selecting presence or absence of signal is available with TTL (RESET) DIP switch
No. 3.
• H level = Logic “1”
• L level = Logic “0”
(5) Receive data (RD)
• Mark: “1”
• Space: “0”
(6) Transmit data (TD)
• Mark: “1”
• Space: “0”
(7) Received control data (DTR) (DTR signal)
• Mark: Data transmission not possible
• Space: Data transmission possible