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Appendix A System Interface Description

A-11

3. Shared Operation

In shared operation the interface buffer capacity is reduced by 256 bytes.

After Power-ON both the serial and the parallel interfaces are available for data

transfer.

If a byte is first recognized by the serial interface the parallel interface is imme-

diately disabled by the BUSY signal. The serial interface is now active and will

operate, using the installed protocols.

If a byte is first recognized by the parallel interface either the DTR signal of the

serial interface is set to OFF or XOFF is sent, depending on the protocol.

If the serial interface starts to receive data while the parallel interface is active, it

is possible to receive 256 bytes of serial data. Any additional serial data will be

lost.

When the interface buffer is completely empty of serial data, and no new data

has been received by the serial interface for more than 10 seconds, both

interfaces are available for data transfer again.

When the interface buffer is completely empty of parallel data and no data has

been received by the parallel interface for more than 60 seconds, the 256 bytes

of serial data will be processed. Afterwards, both interfaces are available for

data transfer again.

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Output Solutions C I - 8 0 6 0 Bedienungsanleitung Seite 133