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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
l Mark = Logic "1" (-3 V to -12 V)
l Space = Logic "0" (+3 V to +12 V)
(5) Receive data (RD signal)
RS-232C
l Mark
= 1
l Space
= 0
(6) Data receiving control (DTR signal)
RS-232C
l Mark : Data transfer not possible
l Space : Data transfer possible
(7) Data transmission control (TD signal)
DC1 code(11H) X-ON
DC3 code(13H) X-OFF
CITIZEN
: Data reception possible
: Data reception not possible
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CBM-230/231 User's Manual
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