Data Receiving Control; Buffering - Citizen BD2-2880 User Manual

6.5 Data Receiving Control

When BUSY signal is "LOW", data from the host can be received. When it being "HIGH", data
cannot be received.

6.6 Buffering

This control board incorporates 2K byte buffer.
Therefore, big data can be buffered in input buffer, and the host side can be released immediately.
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BD2-2880/2890 User's Manual