Nibble (Reverse), Ecp Mode; Table 1-9. Parallel Interface Pin Assignment - Epson EPL-N1200 Service Manual

General Description

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
1 STROBE
2-9 DATA 1-8
10 ACKNLG
11 BUSY
12 PE
13 SLCT
14 AUTO-FEED
15 NC
16 GND
17 CHASSIS GND
18 NC
19-30 GND
31 INIT
32 ERROR
33 GND
34 NC
35 +5
36 SLCT IN
1-14
I/O
HostClk: This signal is a strobe pulse used to read extension
IN
request values from the host computer during negotiation.
The signals are data bits of extension request values during
negotiation. This printer supports following values:
IN
0000 0100: Request Device ID (by nibble mode sending)
0000 0000: Request nibble mode
OUT PtrClk: Printer data sending clock.
PtrBusy: Printer sending data bits 3 and 7 during data transfer
OUT
to host computer.
AckDataReq: Printer sending data bits 2 and 6 during data
OUT
transfer to host computer.
Xflag: Printer sending data bits 2 and 6 during data transfer to
OUT
host computer.
HostBusy: This signal informs the printer of the host computer
IN 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.
IN nInit: High level fixed
nDataAvail: Printer sending data bits 0 and 4 during data
OUT
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
IN
P1284 (reverse mode).
EPL-N1200 Service Manual
Description
Rev. A