CBM America CBM-730, CBM-710, CBM-750, CBM-720 manual Serial Interface, Specifications

CBM-710/720/730/750 User ’s Manual

9.SERIAL INTERFACE

9.1Specifications

a)Synchronism

b)Baud rate: RS-232C type Current Loop type

:Asynchronous

:110, 150, 300, 600, 1200, 2400, 4800, 9600BPS (Selected by user)

: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).

25 CITIZEN