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Interfaces

214

PrtBusy (Busy)

Compatibility Mode: Driven high to indicate that the printer is not ready to receive data.

Negotiation Phase: Reflects the present state of the printer's forward channel.

Reverse Data Transfer

Phase:

Nibble Mode: Data bits 3 then 7, then forward channel busy status

Byte Mode: Forward channel busy status.

Reverse Idle phase: Forward channel busy status.

AckDataReq (PError)

Compatibility Mode: Driven high to indicate that the printer has encountered an error in the paper

path. The printer shall set nFault low whenever it sets PError high.

Negotiation Phase: Set high to indicate 1284 support, then follows nDataAvail (nFault).

Nibble Mode: Data bits then 6. Reverse Data Transfer

Phase:

Byte Mode: same as nDataAvail (nFault)

Reverse Idle Phase: Set high until host requests data transfer, then follows nDataAvail (nFault).

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Compuprint 10200 Programmer Manual Manuale Utente Pagina 218