BIXOLON SRP-270 2d Signal Description, 2f S/W Flow Control, IEEE1284 Parallel Interface

SRP-270

3-5-2(d) Signal Description						Function
	Pin No.	Signal name	Direction
	1	Frame GND	-		Frame Ground
	2	SD2	Output		Send Data
	3	SD1	Output		”H” : SD1 > SD2 , “L” : SD1 < SD2
	4	RD2	Input		Receive Data
	5	RD1	Input		”H” : RD1 > RD2 (RD1-RD2 ≥ 0.2V)
					“L” : RD1 < RD2 (RD1-RD2 ≤ 0.2V)
	7	SGND	-		Signal Ground
					When DTR/DSR is selected, this signal indicates whether the printer is
	8	DR2			BUSY or READY. (H/W flow control)
			Output	1)		DR1 > DR2 (H) : The printer is BUSY.
	9	DR1		2)		DR1 < DR2 (H) : The printer is READY.
				3)		The host computer transmits a data to the host,
						after confirming this signal.
					When DTR/DSR is selected, this signal indicates whether the host
	10	CS2	Input		computer is BUSY or READY. (H/W flow control)
				1)		CS1 > CS2 (H) : The host computer is BUSY.
	11	CS1
				2)		CS1 < CS2 (H) : The host computer is READY.
				3)		The printer transmits a data to the host, after confirming this signal.

Table 3-17 RS-485 Pin Description

※Note : BUSY condition and other information refer to the User’s Manual.

※Note : This format is used when the UART for RS-232C is connected to the RS-485 driver.

3-5-2(e) H/W Flow Control

When DR1,2/CR1,2 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.

3-5-2(f) S/W Flow Control

When XON/XOFF flow control is selected, the printer transmits XON(ACSII 11h) or XOFF(ASCII 13h) signal through the TXD line. If the Printer is BUSY, the Printer transmits XOFF(ASCII 13h) to host through the TXD line. Then the host recognize that the Printer is BUSY. So, the host does not transmit a data to the Printer. If the Printer is released from BUSY, the Printer transmits XON(ASCII 11h) to host through the TXD line. Then the host recognize that the Printer is not BUSY. And the host transmit a data to the Printer.

※Note : Refer to the Operation Manual about XON/XOFF flow control.

3-5-3 IEEE1284 Parallel Interface

Bidirectional parallel interface : in accordance with the IEEE1284 Nibble/Byte mode.

3-5-3(a) Forward Mode Specification (Compatibility mode)

Data transmission from host computer to printer : Centronics compatiable

Item	Description	Remark
Data Transmission	• 8-bit Parallel
Synchronization	• External supplied nStrobe signals
HandShaking	• nACK and Busy signals
Signal Level	• TTL compatiable
Connector	• Centronics 36P
	Table 3-18 IEEE1284 Specification

Rev. 3.02 - 25 -