EPSON Stylus Pro 9000
Appendix 165
* Direction from the printer.
The interface condition is normally TTL Level, and each high/low signal takes 0.2uS or less.
The printer only sends data after receiving the ACKNLG confirmation or when the BUSY signal is low.
Table 7-8. Pin Assignment For Forward Channel
Pin No. Signal Name Return
GND Pin
Direction* Functional Description
1STROBE 19 In
Data reception pulse, 0.5 uS or greater pulse width required. Usual state is HIGH, and reads data after going to LOW state.
2-9 DATA 0 to 7 20 to 7 In
The DATA0 through DATA7 signals represent data bits 0 to7, respectively. Each signal is at high level when data is logical 1 and low level
when data is logical 0. These signals are used to transfer the 1284 extensibility request values to the printer.
10 ACKNLG 28 Out
When LOW the printer has finished preparing to receive signals and can accept data. Pulse width is about 1uS or 3uS Printer clock signal.
11 BUSY 29 Out
HIGH means the printer cannot receive data. This occurs when the printer is receiving data or when the printer is in an error state.
12 PE 28 Out
HIGH means no paper is loaded. (LOW means an error.)
13 SLCT 28 Out
Always HIGH. Pulled up to +5V via 1.0 Kohm.
14 AFXT 30 In
Not used.
15 NC
Not connected.
16 GND
Ground for twisted pair return.
17 Chassis
Ground for frame/body.
18 Logic H
Pulled up to +5 V via 3.9 Kohm.
19-30 GND
Ground for twisted pair return.
31 INIT 30 In
Pulse width of 50 uS or more means LOW pulse, and the falling edge of LOW signal causes the printer to initialize.
32 ERROR 29 Out
LOW means printer error.
33 GND — —
Ground for twisted pair return.
34 NC — —
Not connected.
35 +5V — Out
HIGH during normal operation. Pulled up to +5V via 1.0K ohm.
36 SLCTIN 30 In
Not used.
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