Epson C40UX service manual USB Interface, Parallel Interface Forward Channel

Stylus C40UX/C40SX/C20UX/C20SX Revision A

1.4 INTERFACE

Interface specification for each model are as the following. Parallel Interface :EPSON Stylus C40SX .EPSON Stylus C20SX USB Interface :EPSON Stylus C40UX .EPSON Stylus C20UX

*This printer interface as standard.

1.4.1 USB Interface

	Standard			: based on
	“Universal Serial Bus Specifications Revision 1.1”
	“Universal Serial Bus Device Class Definition for Printing Devices Version
	1.1”
	Bit rate			: 12Mbps (Full Speed Device)
	Data encording			: NRZI
	Adaptable connector			: USB Series B
	Recommended cable length			: 2 meters
Connect er pin assinment and signals:
Pin No.		Signal name	In/Out		Function description
1		VCC	-	Cable power. Maximum power consumption is
				100mA
2		Data	bi-directional	Data
3		+Data	bi-directiona	data, pull up to +3.3V via 1.5K ohm resistor
4		Ground	-	Cable ground

Figure 1-3. USB Pin Assignment

1.4.2 Parallel Interface (Forward Channel)

Transmission mode	: 8 bit parallel, IEEE-1284 compatibility mode
Synchronization	: By STROBE pulse
Handshaking	: By BUSY and ACKNLG signal
Signal level	: TTL compatible level
Adaptable connector	: 57-30360(amphenol) or equivalent
	BUSY signal is set high before setting either -ERROR
	low or PE high and held high until all these signals
	return to their inactive state.
	BUSY signal is at high level in the following cases.
		-During data entry (see Data transmission timing)
		-When input data buffer is full
		-During -INIT signal is at low level or during
			hardware initialization
		-During printer error (See -ERROR signal)
	ERROR signal is at low level when the printer is in one
	of the following states.
		-Printer hardware error (fatal error)
		-Paper-out error
		-Paper-jam error
		-Ink-out error
		-Ink overflow error
	PE signal is at high level during paper-out error.
Data transmission timing :
DATA
-STROBE
BUSY
-ACKNLG

PRODUCT DESCRIPTION INTERFACE 13