BIXOLON SRP-270 service manual 1c Cable Connection, 1d Signal Description, 1e H/W Flow Control

			SRP-270
3-5-1(c) Cable Connection
PRINTER	HOST	PRINTER	HOST
SIDE (25P)	SIDE (25P)	SIDE (25P)	SIDE (9P)

Figure 3-7 RS-232C Cable Connection

3-5-1(d) Signal Description

Pin No.	Signal name	Direction		Function
1	FG	-	Frame Ground
2	TxD	Output	Transmit Data
3	RxD	Input	Receive Data
4	RTS	Output	Ready To Send
5	CTS	Input	Clear To Send
			This signal indicates whether the host computer can receive data.
			(H/W flow control)
			1)	MARK(Logic1) : The host can receive a data.
6	DSR	Input	2)	SPACE(Logic0) : The host can not receive a data.
			3)	The printer transmits a data to the host, after confirming
				this signal.
			4)	When XON/XOFF flow control is selected, the printer does
				not check this signal.
7	SG	-	Signal Ground
			This signal indicates whether the printer is busy. (H/W flow control)
			1)	MARK(Logic1) : The printer is busy.
20	DTR	Output	2)	SPACE(Logic0) : The printer is not busy.
			3)	The host transmits a data to the printer, after confirming
				this signal.
			4)	When XON/XOFF flow control is selected, the host does not
				check this signal.
		Table 3-15 RS-232C Pin Description

3-5-1(e) H/W Flow Control

When DTR/DSR flow control is select, before transmitting a data, the Printer checks whether the host is BUSY or not. If the host is BUSY, the Printer does not transmit a data to the host. If the host is not BUSY, the Printer transmits a data to the Host. The host is the same. Refer to the Interface Part of Chapter 4-3 Special Circuit Diagrams.

Rev. 3.02 - 23 -