Epson MX-70 User Manual - Page 99

Signal, Return, Pin No., Direction, FEED X, CHASSIS-GND, to 30, ERROR, RESET

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Appendix J Signal Pin No. 12 13 14 15 16 17 Return Pin No. 30 - - Table 7 (Cont'd) Signal PE SLCT AUTO FEED X Direction OUT OUT In NC OV CHASSIS-GND Description Always GND Level. Pulled up to +5V via 3.3κΩ resistor. With this signal being at "LOW" level, the paper is automatically fed one line after printing. (The signal level can be fixed to "LOW" with AUTO provided on the control circuit board.) Not used. Logic GND level. Printer chassis GND. In the printer, the chassis GND and the logic GND are isolated from each other. 18 - 19 to 30 - 31 - 32 33 - 34 - 35 36 - +5V GND INIT ERROR GND RESET NC In Out - Out - +5V TWISTED-PAIR RETURN signal GND level. When the level of this signal becomes "LOW", the printer controller is reset to its initial state and the print buffer is cleared. This signal is normally at "HIGH" level. and its pulse width must be more than 50µs at the receiving terminal. Always "HIGH" level Pulled up to +5V via 3.3κΩ resistor. Same as with Pin Nos. 19 to 30. Reset signal generated when the Printer is powered, or when the INIT signal is applied to the Printer. Pulled up to +5V via 3.3κΩ resistor. Not used. NOTES: 1. "Direction" refers to the direction of signal flow as viewed from the printer 2. "Return" denotes "TWISTED PAIR RETURN" and is to be connected at signal ground level As to the wiring for the Interface. be sure to use a twisted-parr cable for each signal and never fall to complete connection on the Return side. To prevent noise effectively. these cables should be shielded and connected to the chassis of the host computer and the printer. respectively. 3 All interface conditions are based on TTL level. Both the rise and fall times of each signal must be less than 0.2µs. 4. Data transfer must not be carried out by ignoring the ACKNLG or BUSY signal. (Data transfer to this printer can be carried out only after confirming the ACKNLG signal or when the level of the BUSY srgnal IS "LOW".) 102

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Appendix J
Table 7 (Cont’d)
Signal
Return
Pin No.
Pin No.
Signal
Direction
Description
12
30
PE
OUT
Always GND Level.
13
-
SLCT
OUT
Pulled up to +5V via
3.3κΩ
resistor.
14
-
AUTO
In
FEED X
With this signal being at "LOW" level, the
paper is automatically fed one line after
printing.
(The signal level can be fixed to "LOW"
with AUTO provided on the
control circuit board.)
15
-
NC
Not used.
16
-
OV
Logic GND level.
17
-
CHASSIS-GND
Printer chassis GND.
In the printer, the chassis GND and the
logic GND are isolated from each other.
18
-
+5V
-
+5V
19 to 30
-
GND
-
TWISTED-PAIR RETURN signal GND level.
31
-
INIT
In
When the level of this signal becomes
"LOW", the printer controller is reset to its
initial state and the print buffer is cleared.
This signal is normally at "HIGH" level.
and its pulse width must be more than
50μs at the receiving terminal.
32
ERROR
Out
Always "HIGH" level Pulled up to +5V via
3.3κΩ
resistor.
33
-
GND
-
Same as with Pin Nos. 19 to 30.
34
-
RESET
Out
Reset signal generated when the Printer is
powered, or
when the INIT signal is
applied to the Printer.
35
Pulled up to +5V via
3.3κΩ
resistor.
36
-
NC
-
Not used.
NOTES: 1. “Direction” refers to the direction of signal flow as viewed from the
printer
2. “Return” denotes “TWISTED PAIR RETURN” and is to be connected at
signal ground level
As to the wiring for the Interface. be sure to use a twisted-parr cable for
each signal and never fall to complete connection on the Return side.
To prevent noise effectively. these cables should be shielded and con-
nected to the chassis of the host computer and the printer. respec-
tively.
3 All interface conditions are based on TTL level. Both the rise and fall
times of each signal must be less than 0.2μs.
4. Data transfer must not be carried out by ignoring the ACKNLG or BUSY
signal. (Data transfer to this printer can be carried out only after con-
firming the ACKNLG signal or when the level of the BUSY srgnal
I
S
“LOW”.)
102