Citizen Systems CBM-231 - Manual (Page 25)

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
Start bit : 1 bit
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" (+3 V to +12 V)
(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