Epson EPL-N1200 Service Manual - Page 27
Parallel Interface State Switch Diagram, SLCT IN=HIGH
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EPL-N1200 Service Manual Compatibility Mode Forward Data Transfer STROBE ACK and BUSY Forward Idle General Description Terminate SLCT IN=HIGH Failed Negotiation SLCT IN=LOW ERR=HIGH No data sent Negotiation ERR=LOW Sending data Host Busy Data Not Available ERR=HIGH No data sent AUTO FEED=LOW Reverse Data Transfer ERR=LOW Sending data AUTO FEED=LOW Request to send data Host Busy Data Available AUTO FEED=HIGH Reverse Idle ERR=LOW Interrupt Host Figure 1-4. Parallel Interface State Switch Diagram Figure 1-4 shows the parallel interface state switch diagram. Rev. A 1-15
Figure 1-4 shows the parallel interface state switch diagram.
Forward
Data
Transfer
Forward
Idle
STROBE
ACK and BUSY
Compatibility Mode
Terminate
Negotiation
SLCT IN=HIGH
Failed
Negotiation
Reverse
Data
Transfer
Host Busy
Data
Available
Host Busy
Data Not
Available
ERR=HIGH
No data sent
ERR=LOW
Sending data
ERR=LOW
Sending data
ERR=HIGH
AUTO
FEED=LOW
No data sent
Request to
send data
Reverse
Idle
Interrupt
Host
SLCT IN=LOW
ERR=LOW
AUTO
FEED=LOW
AUTO
FEED=HIGH
Figure 1-4. Parallel Interface State Switch Diagram
EPL-N1200 Service Manual
General Description
Rev. A
1-15