Epson LQ 300 - Page 21

LQ-300 Service Manual
Product Description
1.3.1.2 Reverse Mode
LQ-300 reverse mode supports IEEE-P1284 nibble mode, described in this section.
Transmission mode: IEEE-P1284 nibble mode
Signal level:
IEEE-P1284 level 1 device
Adaptable connector:
36-pin 57-30360 (Arnphenol) or equivalent
Table 1-14. Signal and Connector Pin Assignments for Parallel Interface
Pin No. Signal Name
C%%”%
‘0’
Description
1 HostClk 19
In
Host clock signal.
2-9
DATAO-7
20-27 In
Signals DATAO through DATA7 represent data
bits O to 7.
10
Ptrclk 28 out Printer clook signaL
11
PtrBusy /
29
out
Printer busy signal and reverse channel transfer
DataBit-3,7
data bit 3 or 7.
12
AckDataReq
/
28
out
Acknowledge data request signal and reverse
DataBit-2,6
channel transfer data bit 2 or 6.
13
Xflag I
28
out
X-flag signal and reverse channel transfer data
DataBit-l,5
bit 1 or5.
14
HostBusy
30
In
Host busy signal.
15 NC
—
—
Not oonnected.
16
GND
.
—
Signal ground.
17 Chassis
GND
— —
Chassis ground.
18
Logic-H
—
out
Pulled up to +5
V via 3.9K Q resistor.
19-30 GND
—
—
Signal ground.
31
m 30
In Not used.
32
DataAvail /
29
out
Data available signal and reverse channel
DataBit-0,4
transfer bit O or 4.
33
GND
— —
Signal ground.
34
NC
—
—
Not oonnected.
35
+5
v
—
out
Pulled up to +5 V via 3.3K S2 resistor.
36
1284-Active
30
In 1284 active signal.
*
The l/O column indicates the direction of the signal as viewed from the printer.
Rev. A
1-13