Epson LX-90 User Manual - Parallel 8620 PIC for LX-90 - Page 108

Notes, Signal

Get Epson LX-90 - Impact Printer PDF manuals and user guides View all Epson LX-90 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 108 highlights

Table D-3, continued Signal Return Pin Pin Signal 13 - SLCT 14 - 15 - 16 - 17 - 18 - 19 - 30 - 31 - NC NC NC CHASSIS GND NC GND INIT 32 - ERROR 33 - NC 34 - NC 35 - NC 36 - NC Direction Description OUT Pulled up to + 5 volts through 3.3K ohm resistance. - Unused. - Unused. - Unused. Printer's chassis ground, which is - isolated from the logic ground. - Unused. - Twisted-pair return signal ground level. IN When this level becomes LOW, the printer controller is reset to its powerup state and the print buffer is cleared. This level is usually HIGH; its pulse width must be more than 50 microseconds at the receiving terminal. OUT This level becomes LOW when the printer is in: 1) Paper-end state. 2) Off-line. 3) Error state. - Unused. - Unused. - Unused - Unused. Notes: 1. The column heading "Direction" refers to the direction of signal flow as viewed from the printer. 2. "Return" denotes the twisted-pair return, 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. To prevent noise, these cables should be shielded and connected to the chassis of the host computer or the printer but not at both ends. 3. All interface conditions are based on TTL level. Both the rise and the fall times of each signal must be less than 0.2 microseconds. D-5

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
Table D-3, continued
Signal
Return
Pin
Pin
Signal
Direc-
tion
13
-
SLCT
OUT
14
-
NC
-
15
-
NC
-
16
-
NC
-
17
-
CHASSIS
GND
-
18
-
NC
-
19 - 30
-
GND
-
31
-
INIT
IN
32
-
ERROR
OUT
33
-
NC
-
34
-
NC
-
35
-
NC
-
36
-
NC
-
Unused.
Unused.
Description
Pulled up to + 5 volts through 3.3K
ohm resistance.
Unused.
Printer’s chassis ground, which is
isolated from the logic ground.
Unused.
Twisted-pair return signal ground level.
When this level becomes LOW, the
printer controller is reset to its power-
up state and the print buffer is
cleared. This level is usually HIGH; its
pulse width must be more than 50
microseconds at the receiving
terminal.
This level becomes LOW when the
printer is in:
1) Paper-end state.
2) Off-line.
3) Error state.
Unused.
Unused.
Unused
Unused.
Notes:
1. The column heading “Direction” refers to the direction of signal
flow as viewed from the printer.
2.
“Return” denotes the twisted-pair return, 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. To prevent noise, these cables should be shielded and con-
nected to the chassis of the host computer or the printer but not at
both ends.
3. All interface conditions are based on TTL level. Both the rise and
the fall times of each signal must be less than 0.2 microseconds.
D-5