Citizen Systems CBM-270 user manual Serial Interface, Rxd, Dtr, 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

7.3Input and Output Signals