ProgrammerManual PTX‐S828
AppendixB‐Interfaces 367 260071‐001A
n.a. (nInit)
Compatibility Mode: Pulsed low in conjunction with 1284 Active low to reset the interface and force to
return to Compatibility Mode idle phase.
Negotiation Phase: Set HIGH.
Reverse Data Transfer Set HIGH.
Phase:
nDataAvail (NFault)
Compatibility Mode: Set low to indicate that an internal printer error has occurred.
Negotiation Phase: Set high to acknowledge 1284 compatibility. In Nibble or Byte Mode it is then set low
to indicate printer-to-host data is available following host setting HostBusy (nAutoFd)
high.
Reverse Data Transfer Nibble Mode: Set low to indicate that printer is ready to send to host. Then used to
Phase: send data bits 0 then 4.
Byte Mode: Used to indicate that data is available.
Reverse Idle phase: Used to indicate that data is available.
nDataAvail (NFault)
Compatibility Mode: Set low to indicate that an internal printer error has occurred.
Negotiation Phase: Set high to acknowledge 1284 compatibility. In Nibble or Byte Mode it is then set low
to indicate printer-to-host data is available following host setting HostBusy (nAutoFd)
high.
Reverse Data Transfer Nibble Mode: Set low to indicate that printer is ready to send to host. Then used to
Phase: send data bits 0 then 4.
Byte Mode: Used to indicate that data is available.
Reverse Idle phase: Used to indicate that data is available.
1284 Active (NSelectIn)
Compatibility Mode: Set low by host to select printer.
Negotiation Phase: Set high in conjunction with Host Busy being set low to request a 1284 mode.
Reverse Data Transfer Set high to indicate that bus direction is printer to host. Set low to terminate 1284
Phase: mode and set bus direction host to printer.
Reverse Idle Phase: Same as Reverse Data Transfer phase.
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