Epson EPL-N1200 Service Manual - Page 26

Table 1-9., Parallel Interface Pin Assignment

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General Description EPL-N1200 Service Manual 1.3.1.2 Nibble (Reverse), ECP Mode The reverse mode for EPL-N1200 supports the IEEE-P1284 nibble mode. This printer can run in reverse mode, in which the printer can inform the computer of its status by EJL and PJL commands. System: Nibble mode of IEEE-P1284 Connector type: P90-25027-1 (Amphenol) receptacle Applicable plug: 57-30360( Amphenol or equivalent) Signal description: See Table 1-9. Table 1-9. Parallel Interface Pin Assignment Pin No. Signal Name I/O Description 1 2-9 10 11 12 13 14 15 16 17 18 19-30 31 32 33 34 35 36 STROBE IN DATA 1-8 IN ACKNLG BUSY PE SLCT OUT OUT OUT OUT AUTO-FEED IN NC - GND - CHASSIS GND - NC - GND - INIT IN ERROR OUT GND - NC - +5 - SLCT IN IN HostClk: This signal is a strobe pulse used to read extension request values from the host computer during negotiation. The signals are data bits of extension request values during negotiation. This printer supports following values: 0000 0100: Request Device ID (by nibble mode sending) 0000 0000: Request nibble mode PtrClk: Printer data sending clock. PtrBusy: Printer sending data bits 3 and 7 during data transfer to host computer. AckDataReq: Printer sending data bits 2 and 6 during data transfer to host computer. Xflag: Printer sending data bits 2 and 6 during data transfer to host computer. HostBusy: This signal informs the printer of the host computer state. When the signal is HIGH, the host computer cannot accept data. Not used. Logic ground level. Connected to the printer chassis. The printer chassis GND and the signal GND are connected to each other. Not connected. Ground level for the twisted pair return signal. nInit: High level fixed nDataAvail: Printer sending data bits 0 and 4 during data transfer to host computer. Same as for pins 19 to 30. Not used. Pulled up to +5V through 1.0 Kohm resistance. 1284Active: If this signal is set to HIGH, this printer active P1284 (reverse mode). 1-14 Rev. A

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1.3.1.2
Nibble (Reverse), ECP Mode
The reverse mode for EPL-N1200 supports the IEEE-P1284 nibble mode. This printer can run in
reverse mode, in which the printer can inform the computer of its status by EJL and PJL commands.
System:
Nibble
mode
of
IEEE-P1284
Connector type:
P90-25027-1
(Amphenol)
receptacle
Applicable plug:
57-30360(
Amphenol
or
equivalent)
Signal description:
See
Table
1-9.
Table 1-9.
Parallel Interface Pin Assignment
Pin No.
Signal Name
I/O
Description
1
STROBE
IN
HostClk: This signal is a strobe pulse used to read extension
request values from the host computer during negotiation.
2-9
DATA 1-8
IN
The signals are data bits of extension request values during
negotiation. This printer supports following values:
0000 0100: Request Device ID (by nibble mode sending)
0000 0000: Request nibble mode
10
ACKNLG
OUT
PtrClk: Printer data sending clock.
11
BUSY
OUT
PtrBusy: Printer sending data bits 3 and 7 during data transfer
to host computer.
12
PE
OUT
AckDataReq: Printer sending data bits 2 and 6 during data
transfer to host computer.
13
SLCT
OUT
Xflag: Printer sending data bits 2 and 6 during data transfer to
host computer.
14
AUTO-FEED
IN
HostBusy: This signal informs the printer of the host computer
state. When the signal is HIGH, the host computer cannot
accept data.
15
NC
-
Not used.
16
GND
-
Logic ground level.
17
CHASSIS GND
-
Connected to the printer chassis. The printer chassis GND
and the signal GND are connected to each other.
18
NC
-
Not connected.
19-30
GND
-
Ground level for the twisted pair return signal.
31
INIT
IN
nInit: High level fixed
32
ERROR
OUT
nDataAvail: Printer sending data bits 0 and 4 during data
transfer to host computer.
33
GND
-
Same as for pins 19 to 30.
34
NC
-
Not used.
35
+5
-
Pulled up to +5V through 1.0 Kohm resistance.
36
SLCT IN
IN
1284Active: If this signal is set to HIGH, this printer active
P1284 (reverse mode).
General Description
EPL-N1200 Service Manual
1-14
Rev. A