Fenix Imvico TK51 Series, Руководство по эксплуатации

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FENIX IMVICO
TK51/IF9000 OPERATION MANUAL
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3.5.10- PARALLEL PORT ERROR DETECTION FLOW CHART
The TK51/IF9000 meets the IEEE-1284 standard, in the nibble mode variant.
Fig.3.10- Phase transitions of the nibble mode.
NOTES
✔
The host system can request the negotiation phase at any time, but the
TK51/IF9000 will only return a status byte if the host system has send the
DEL EOT command previously.
✔
The circles represent the IEEE1284 phases.
✔
This diagram can not be considered as the true state diagram.
✔
If the printer control of the host system does not have enabled or implemented the
nibble mode according to the IEEE-1284 interface, only the compatibility mode will
make communication possible. In this case, the error signaling is reduced to the
information provided by the
PError and nFault pins.
END
HOST SYSTEM
END request
Compatibility mode
HOST
SYSTEM.
Forward idle
PERIPHERAL
Data transfer
Host system
Data transfer
HOST SYSTEM requires
reverse transfer
Host system
busy.
Data available
Host system
busy
Data not
available
Negotiation
PERIPHERAL has
data to send
PERIPHERAL
does not have
data to send
Host system does
not receive data
byte.
Peripheral does not
have more data to
send
Host system
requires data
byte
PERIPHERAL
Busy,ACK,PE,/ERR
Interface
returns to
compatibility
mode
DEL EOT command not
previously sent
DEL EOT command
send previously
Negotiation
error
Reverse data
transfer