Citizen Systems CBM-290 - Manual (Page 28)

CITIZEN 28
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
l Mark = logic " 1" (-3V - -12V)
l Space
= logic " 0" (+3V - +12V)
(5) Receiving data (RD signal)
RS-232C
l Mark = 1
l Space
= 0
(5) Receiving control (DTR signal)
RS-232C
l Mark : Data transfer not available
l Space
: Data transfer available
(6) Transmission control (TD signal)
DC1 code (11H) X-ON
: Data reception available
DC3 code (13H) X-OFF : Data reception not available