Epson TM-T88II Series Manual de Instruções Página 130

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Appendix A-4 Rev. A
Data transmission should not ignore the signal nAck or Busy. An attempt to transmit data with
either signal, nAck or Busy, ignored can cause lost data. (Data transmission to the printer
should be made after verifying the nAck signal or while the Busy signal is low.)
Interface cables should be as short as possible.
Precautions on receiving status from the printer
The printer status transmission is available by using the both-way communication facility in the
Nibble/Byte mode in accordance with the IEEE 1284 mode.
The following precautions must be taken for receiving the status from the printer.
The allowable capacity of the printer’s internal buffer is 100 bytes. Status signals exceeding
this capacity will be discarded. To prevent possible loss of status data, the host should
always be ready for data reception (reverse mode).
When ASB is used, the host should be in the wait state for data reception (reverse idle
mode). When this state is not available, the host should enter the reverse mode to always
monitor the presence of data.
When ASB is used, preference should 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 should be transmitted together at one time as one
ASB status showing the change has been made, followed by the latest ASB status.
Example: In the normal (wait) state, the ASB status is configured as follows:
1st status 2nd status 3rd status 4th status
0000 1000 0000 0000 0000 0000 0000 0000
When the following sequence of operations is performed, near end detection, cover open, cover closed, the
following pieces of data are accumulated.
1st status 2nd status 3rd status 4th status
1 0000 1000 0000 0000 0000 0011 0000 0000 Near end detection
2 0010 1000 0000 0000 0000 0011 0000 0000 Cover open
3 0000 1000 0000 0000 0000 0011 0000 0000 Cover closed
When the ASB status is received following this, a total of 8 bytes of ASB will be transmitted as follows.
Accumulated ASB (1+2+3)
1st status 2nd status 3rd status 4th status
Accumulated ASB (1+2+3) 0010 1000 0000 0000 0000 0011 0000 0000
+ 1st status 2nd status 3rd status 4th status
The latest ASB (3) 0000 1000 0000 0000 0000 0011 0000 0000
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