Serial interface – CBM America CBM-720 User Manual
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CBM-710/720/730/750 User’s Manual
25
CITIZEN
9.
SERIAL INTERFACE
9.1
Specifications
a) Synchronism
: Asynchronous
b) Baud rate:
RS-232C type
: 110, 150, 300, 600, 1200, 2400, 4800, 9600BPS (Selected by user)
Current Loop type
: 110, 150, 300, 600, 1200BPS (Selected by user)
c) Composition of one word:
Start bit
: 1bit
Data bit
: 7 or 8 bits (selected by user)
Parity bit
: Odd, even or no parity (Selected by user)
Stop bit
: 1bit or more
d) Signal Polarity :
RS-232C type
: *Mark = Logic "1" (-3V to -12V)
*Space = Logic "0" (+3V to +12V)
Current Loop type
: *Mark = Logic "1" (Current ON)
*Space = Logic "0" (Current OFF)
e) Received Data:
RS-232C & Current Loop (RD signal)
*Mark = 1
*Space = 0
f) Receiving Control (DTR signal)
RS-232C
: *Mark:
Data Transfer not possible
*Space:
Data Transfer possible
Current Loop:
*Mark (Current ON):
Data Transfer possible
*Space (Current OFF):
Data Transfer not possible
g) Transmission Control (TD signal)
DC1 code (11H) "X" ON
:
Data Receiving possible
DC3 code (13H) "X" OFF:
Data Receiving not possible
However, this is valid only for type B input buffer (7K).