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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).