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CBM-230/231 User’s Manual
20
CITIZEN
7. SERIAL INTERFACE
7.1 Specifications
(1) Synchronizing system : Asynchronous
(2) Baud rate
150, 300, 600, 1,200, 2,400, 4,800, 9,600, 19,200 bps (Selected by the user)
(3) Word length
Startbit :1bit
Data bit : 7 bits or 8 bits (Selected by the user)
Parity bit : Odd/even parity or no parity (Selected by the user)
Stop bit : 1 bit or more
(4) Signal polarity
RS-232C
• Mark = Logic "1" (–3 V to –12 V)
• Space =Logic"0"(+3Vto+12V)
(5) Receive data (RD signal)
RS-232C
• Mark = 1
• Space = 0
(6) Data receiving control (DTR signal)
RS-232C
• Mark : Data transfer not possible
• Space : Data transfer possible
(7) Data transmission control (TD signal)
DC1 code(11H) X-ON : Data reception possible
DC3 code(13H) X-OFF : Data reception not possible