Citizen CBM-270 user manual Serial Interface, Rxd, Dtr, Txd, Dsr

CBM-270 User’s Manual

7.SERIAL INTERFACE

7.1Specifications

(1)	Synchronous system : Asynchronous
(2)	Baud rate		: 1,200, 2,400, 4,800, 9,600, 19,200 bps (Selected by the user)
(3)	1-word configuration
	Start bits		: 1 bit
	Data bits		: 8 bits or 7 bits (Setting upon shipment)
	Parity bits		: Odd, even, or no parity (Selected by the user)
	Stop bits		: 1 bit or more
(4)	Signal polarity
	RS-232C
	·Mark	= Logic "1" (-3 ~ -12 V)
	·Space	= Logic "0" (+3 ~ +12 V)
(5)	Received data (RXD signal)
	·Mark	=	1
	·Space	=	0
(6)	Reception control (DTR signal)
	·Mark	:	Data not transferable
	·Space	:	Data transferable
(7)	Transmission control (TXD signal)
	·DC1 code(11H) X-ON			:	Data receivable
	·DC3 code(13H) X-OFF			:	Data not receivable

7.2Connector's Pin Configuration

No.	Signal Name	Input/Output	Function
1	FG		Frame Ground
7	GND		Signal Ground
3	RXD	Input	Received Data
20	DTR	Output	Printer BUSY Signal
2	TXD	Output	Transmitted Data
6	DSR	Input	Data Set Ready

[Note] 1.	The RS-232C signals are based on the EIA RS-232C.
2.	The received data should be always maintained in the Mark status when no data is
	being transferred.
	Applicable connectors (D-Sub connectors)
	Printer side	: 17LE-13250 (Anphenol) or its equivalent
	Cable side	: 17JE-23250 (Anphenol) or its equivalent

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