Epson EPL-9000 Service Manual page 24

Service Manual
Reverse Mode
1.3.1.2
The reverse mode for
reverse mode, in which the printer can inform the computer of its status by EJL and PJL
commands.
System:
Connector type:
Applicable plug: 57-30360
Signal description: See Table 1-9.
Table 1-9. Parallel Interface Pin Assignments
Pin No. Signal Name
1 STROBE
2-9
DATA
1-8
10 ACKNLG
11 BUSY
12
PE
13
14 AUTO-FEED
NC
16
17 CHASSIS
18
NC
19-30
31
INIT
32
ERROR
33
34 NC
35 +5
36
Rev.
supports the nibble mode of
nibble
receptacle
or equivalent)
This signal is a strobe pulse used to read extension
IN
request values from the host computer during negotiation.
The signals are data
This printer supports following values:
negotiation.
IN
0000 0100: Request Device ID (by nibble mode sending)
0000 0000: Request nibble mode
OUT
Printer data sending clock.
Printer sending data bits 3 and 7 during data transfer
to host computer.
Printer sending data bits 2 and 6 during data
transfer to host computer.
Printer sending data bits 2 and 6 during data transfer to
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
-
and the signal
Not connected.
.
Ground level for the twisted pair return signal.
IN
High level fixed
Printer sending data bits O and 4 during data
transfer to host computer.
.
Same as for pins19 to 30.
Not
Pulled up to
1284Active: If this signal is set to HIGH, this printer active
IN
(reverse mode).
This printer can run in
Description
bits of extension request values during
are connected to each other.
through 1.0 Kohm resistance.
General Description
1-13