7-3
Switching between on-line and off-line
On-line and off-line switching for the TM-U375P is the same as for the TM-U375. Please see the description in
Chapter 1.
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 interface 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 0000 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 0000 0000 0000 0000 0011 0000 0000 Near end detection
2 0010 1000 0000 0000 0000 0011 0000 0000 Cover open
3 0000 0000 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)
Accumulated ASB (1+2+3) 1st status 2nd status 3rd status 4th status
+ 0010 1000 0000 0000 0000 0011 0000 0000
The latest ASB (3) 0000 0000 0000 0000 0000 0011 0000 0000
CONFIDENTIAL
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