Epson TM U200D Technical Reference - Page 33

Switching between on-line and off-line, Reception of status from the printer through

Get Epson TM U200D - B/W Dot-matrix Printer PDF manuals and user guides View all Epson TM U200D manuals
Add to My Manuals
Save this manual to your list of manuals

Page 33 highlights

TM-U200D/U200PD Technical Manual Switching between on-line and off-line The printer is not equipped with any on-line/off-line switch. The printer is placed into off-line status in either of the followings: t When the power is turned on or until the printer becomes ready for data transmission after it is initialized by the reset signal (nInit) from the interface. t In the process of self-test. t In the process of paper feeding using the paper feed switch. t Between the time when the printer stops printing due to a paper-end and when the on-line recovery wait time finishes after loading paper. (in cases when empty paper supply is detected by either the paper roll end detector or the paper roll near-end detector with a printing halt feature set enabled due to paper shortage by ESC c 4). t When an error has occurred. Reception of status from the printer through the bidirectional parallel interface In the bidirectional parallel interface specifications, the printer status transmission is available by using the both-way communication facility in the Nibble/Byte Modes in accordance with the IEEE 1284. In this case, different from in the RS-232 serial interface specifications, the real-time interruptions from the printer to the host are disabled and thus precautions must be taken to the followings. t Allowable capacity of the printer internal buffer is 100 bytes (except ASB status). The status signals exceeding this capacity will be discarded. To prevent possible loss of status, the host shall be ready for data acception (Reverse Mode). t When ASB is used, the host is preferably in the wait state for data acception (Reverse Idle Mode). When this state is not available, the host shall enter the Reverse Mode to always monitor the presence of data. t When ASB is used, preference shall be given to the ASB status for transmission over the other status signals. Any accumulated ASB status signals left for transmission from the last to the newest ASB status transmission shall be transmitted together at a time as one ASB status showing the presence of change, followed by the lastest ASB status. Example: In the normal (wait) state, the ASB status is configured as follows: First Status 0001 0000 Second Status 0000 0000 Third Status 0000 0000 Fourth Status 0000 0000 When a sequence of operations are proceeded, the PAPER FEED button is pressed and released, the following pieces of data are accumulated. Rev. B Features and General Specifications 1-21

  • 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
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
Rev. B
Features and General Specifications
1-21
TM-U200D/U200PD Technical Manual
Switching between on-line and off-line
The printer is not equipped with any on-line/off-line switch. The printer is placed into off-line
status in either of the followings:
When the power is turned on or until the printer becomes ready for data transmission after it
is initialized by the reset signal (nInit) from the interface.
In the process of self-test.
In the process of paper feeding using the paper feed switch.
Between the time when the printer stops printing due to a paper-end and when the on-line
recovery wait time finishes after loading paper. (in cases when empty paper supply is
detected by either the paper roll end detector or the paper roll near-end detector with a
printing halt feature set enabled due to paper shortage by ESC c 4).
When an error has occurred.
Reception of status from the printer through the bidirectional parallel interface
In the bidirectional parallel interface specifications, the printer status transmission is available
by using the both-way communication facility in the Nibble/Byte Modes in accordance with the
IEEE 1284.
In this case, different from in the RS-232 serial interface specifications, the real-time
interruptions from the printer to the host are disabled and thus precautions must be taken to the
followings.
Allowable capacity of the printer internal buffer is 100 bytes (except ASB status). The status
signals exceeding this capacity will be discarded. To prevent possible loss of status, the host
shall be ready for data acception (Reverse Mode).
When ASB is used, the host is preferably in the wait state for data acception (Reverse Idle
Mode). When this state is not available, the host shall enter the Reverse Mode to always
monitor the presence of data.
When ASB is used, preference shall be given to the ASB status for transmission over the
other status signals. Any accumulated ASB status signals left for transmission from the last
to the newest ASB status transmission shall be transmitted together at a time as one ASB
status showing the presence of change, followed by the lastest ASB status.
Example: In the normal (wait) state, the ASB status is configured as follows:
When a sequence of operations are proceeded, the
PAPER FEED
button is pressed and released,
the following pieces of data are accumulated.
First Status
Second Status
Third Status
Fourth Status
0001 0000
0000 0000
0000 0000
0000 0000