Specifications

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TM-L90
Specification
(STANDARD)
E
2.1.2.7 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, unlike the RS-232 serial interface specifications, the real-time interruptions from the printer
to the host are disabled and thus precautions must be taken:
1) The allowable capacity of the printer internal buffer is 99 bytes (except ASB status). Status
signals exceeding this capacity will be discarded. To prevent possible loss of status, the host
shall be ready for data reception (Reverse Mode).
2) When ASB is used, the host is preferably in the wait state for data reception (Reverse Idle Mode).
When this state is not available, the host shall enter the Reverse Mode to continually monitor the
presence of data.
3) When ASB is used, preference shall be given to the ASB status for transmission over the other
status signals.