Citizen Systems CBM-231 manual Serial Interface, Specifications

CBM-230/231 User’s Manual

7.SERIAL INTERFACE

7.1Specifications

(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

• Mark	= Logic "1"	(–3 V to –12 V)
• Space	= Logic "0"	(+3 V to +12 V)

(5)Receive data (RD signal) RS-232C

• Mark	= 1
• Space	= 0

(6)Data receiving control (DTR signal) RS-232C

• Mark	: Data transfer not possible
• Space	: Data transfer possible
(7) Data transmission control (TD signal)
DC1 code(11H) X-ON		: Data reception possible
DC3 code(13H) X-OFF		: Data reception not possible

20 CITIZEN