Service manual
LQ-2070 Service Manual
Product Description
1.3.2.2 Parallel Interface (Reverse Channel)
●
Transmission mode
IEEE-P1284
nibble mode
. Adaptable comector
57-30360
(Anphenol)
or equivalent
●
Synchronization
Refer to the
IEEE-P1284
Specification
. Handshaking
Refer to the
IEEE-P1284
Specification
●
Signal level
TILcompatible
(IEEE-P1284
level 1 device)
. Data transmission timing
Refer to the specification
Table 1-33 Pin Assignments for Reverse Channel
Pin
Signal
No,
Name
Retl$yn@JD
In/Out
Function Description
1
HostClk
19 In
Host clock signal.
2
DATA1
20
In
Parallel input data to the printer
bit O: LSB
3
DATA2
21
In
bit 1
4
DATA3
22
In
bit 2
5
DATA4 23
In
bit 3
6
DATA5
24
In
bit 4
7
DATA6
25
In
bit 5
8
DATA7
26
In
bit 6
9
DATA8
27
In
bit 7: MSB
10
PtrClk
28
out
Printer clock signal.
11
PtrBusy I
29
out
Printer busy signal and reverse channel transfer of data
DataBit-3,
7
bits 3 or 7
12
AckDataReq/
28
out
Acknowledge data request signal and reverse channel
DataBit-2, 6
transfer of data bits 2 or 6
13
Xflag
/
28
out
X-flag signal and reverse channel transfer of data bits 1
DataBit-l, 5
or 5
14
HostBusy
30
In
Host busy signal.
31
m
30
In
Not used.
32
DataAvail /
29
out
Data available signal and reverse channel transfer of
DataBit-O, 4
data bits O or 4
36
1284-Active
30
In
1284 active signal.
18
Logic H
---
out
This line is pulled up to + 5 V through 3.3K
Q
resistor.
35
+5 v
-..
out
This line is pulled up to +5 V through 3.3K
Q
resistor.
17
Chassis
---
-—
Chassis GND.
16,33,
GND
Signal GND.
19-30
-..
..-
15,34
NC
-..
..-
Not connected.
Rev.A
1-23