Citizen Systems 291 - Manual (Page 33)

CBM-290/291 User’s Manual
19 CITIZEN
7. Serial Interface
7.1 Specifications
(1) Data transfer system: Asynchronous
(2) Baud rates
1200, 2400, 4800, 9600, 19200 bps (Selectable by user)
(3) Configuration of one word
Start bit : 1 bit
Data bit : 8 bits
Parity bit : Add/even or no parity (Selectable by user)
Stop bit : 1 bit or more
(4) Signal polarity
RS-232C
•
Mark = logic " 1" (–3V
∼
–12V)
•
Space = logic " 0" (+3V
∼
+12V)
(5) Receiving data (RD signal)
RS-232C
•
Mark = 1
•
Space = 0
(7) Receiving control (DTR signal)
RS-232C
•
Mark : Data transfer not available
•
Space : Data transfer available
(8) Transmission control (TD signal)
DC1 code (11H) X-ON : Data reception available
DC3 code (13H) X-OFF : Data reception not available