Epson EPL-N2000 Service Manual page 33

EPL-N2000 Service Manual
PeriLH (out)
Init (in)
Compatible mode:
Negotiation phase:
Reverse data transfer
phase:
ECP mode:
Error (out)
Compatible mode:
Negotiation phase:
Reverse data transfer
phase:
Reverse idle phase:
ECP mode:
Slctin
Compatible mode:
Negotiation phase:
Reverse data transfer
phase:
Reverse idle phase:
ECP mode:
HostLogicHigh
GND
CG
+5 V
Rev. A
[SE specification]
Only defined for IEEE 1284-C connector.
As long as this signal is LOW, the Busy signal remains HIGH.
1. The printer processes data received before the signal goes LOW.
2. The printer ignores a LOW strobe pulse input while the signal is
LOW.
Always HIGH.
Always HIGH.
Set to LOW when switching to reverse channel. Data signal can be
transmitted to peripheral devices only when this signal is LOW and
1284 active is HIGH.
Indicates an error has occurred when this signal is LOW.
Goes HIGH when acknowledging compatibility with IEEE 1284.
In nibble mode, goes LOW to indicate data is ready to be sent after
the host computer has set HostBusy(nAutoFeed) to HIGH.
Set to LOW to indicate data to be sent to the host is ready in nibble
mode.
Indicates whether or not data is valid.
Goes LOW when requesting transmission with the host computer.
Effective both in forward and reverse channel.
Always LOW.
Set to HIGH while HostBusy is LOW to request 1284 mode.
Set to HIGH to indicate the bus direction is from the printer to the
host. To terminate 1284 mode, this signal is set to LOW and the bus
direction subsequently reverses to the printer.
Same as the reverse data transfer phase.
Always stays at HIGH level. Set to LOW to terminate ECP mode
and switch back to compatibility mode.
Not used.
Ground level for the twisted pair return signal.
Connected to the printer chassis. The printer chassis GND and then
signal GND are connected to each other.
Pulled up to +5 V through 1K Ω resistor.
Product Description
1-21