SUPER MICRO Computer 500 Pin assignments, Reverse channel

EPSON Stylus COLOR 500

Pin assignments

Signal	Return
pin	pin	Signal		Direction	Description
1	19			IN			pulse to read data.
			STROBE			STROBE
2	20		DATA 0	IN		These signals represent
3	21		DATA 1	IN		information in bits 0 to 7 of
4	22		DATA 2	IN		parallel data respectively. Each
5	23		DATA 3	IN		signal is at HIGH level when data
6	24		DATA 4	IN		is logical 1 and LOW when it is
7	25		DATA 5	IN		logical 0.
8	26		DATA 6	IN
9	27		DATA 7	IN
10	28			OUT		About a 5-μs pulse. LOW
			ACKNLG
						indicates data has been received
						and the printer is ready to accept
						more data.
11	29		BUSY	OUT		A HIGH signal indicates the
						printer cannot receive data. The
						signal goes HIGH in the following
						cases:
						1) During data entry (for each
						character)
						2) During initialization
						3) During self test,
						demonstration, and
						default-setting printing
						4) During a printer-error state
12	28		PE	OUT		A HIGH signal indicates the
						printer is in a paper-out state or
						in an error state
13	28		SLCT	OUT		Always at high when printer is on
14	30			IN		Not used
			AUTO
			FEED
			XT
15	-		NC	-		Not connected
16	-		GND	-		Logic ground level
17	-		CHASSIS	-		Printer's chassis ground, which
			GND			is connected to the logic ground
18	-		Logic H	OUT	Pulled up to +5 V through 3.9 KΩ
						resistance
19–30	-	GND		-	Twisted-pair return signal
						ground level
31	30			IN		When this signal goes LOW, the
			INIT
						printer controller is reset to its
						state when the power is first
						turned on and the print buffer is
						cleared. This level is normally
						HIGH; its pulse width must be
						more than 50 μs at the receiving
						terminal.
32	29			OUT		This signal level goes LOW
			ERROR
						when the printer:
						1) Is out of paper
						2) Is in an error state
						3) Has no ink cartridges installed
33	-		GND	-		Same as for Pins 19-30
34	-		NC	-		Not connected
35	-		+5 V	OUT		Pulled up to +5 V through 3.3 KΩ
						resistance
36	30		SLIN	IN	Not used

Note:

■The column heading “Direction” refers to the direction of signal flow as viewed from the printer.

■“Return Pin” denotes the twisted-pair return pin to be connected at signal ground level. For the interface wiring, be sure to use a twisted-pair cable for each signal and to complete the connection on the return side.

■All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2 microseconds.

■Data transfer must be carried out by observing the ACKNLG or BUSY signal. Data transfer to this printer can be carried out only after receipt of the ACKNLG signal or when the level of the BUSY signal is LOW.

Reverse channel
Transmission
mode:	IEEE-1284 Nibble mode
Adaptable
connector:	57-30360 (Amphenol) or equivalent
Synchronization: Refer to the IEEE-1284 specification
Handshaking:	Refer to the IEEE-1284 specification
Signal level:	IEEE-1284 level 1 device
Data
transmission
timing:	Refer to the IEEE-1284 specification
Extensibility
request:	The printer responds to the extensibility
	request in the affirmative when the request
	is 00H or 04H, which means:
	00H: Request nibble mode of reverse
	channel transfer
	04H: Request device ID in nibble mode of
	reverse channel transfer

EPSON Stylus COLOR 500 - 4 6/96 Ink Jet Printers