Parallel Interface (Reverse Channel) - Epson LX-300+ Service Manual

LX-300+/1170

1.3.2 Parallel Interface (Reverse Channel)

o
Transmission mode:
o
Adaptable connector:
o
Synchronization:
o
Handshaking:
o
Signal level:
See 1.3.1 "Parallel Interface (Forward Channel)"
o
Data transmission timing:
o
Extensibility request:
affirmatively, when the request is 00H or 004H, which means;
00H: Request for nibble mode of reverse channel transfer
04H: Request device ID in nibble mode of reverse channel transfer
o
Device ID: The printer sends following device ID string when it is requested.
n
When IEEE1284.4 is enabled;
[00H][4EH]
MFG: EPSON;
CMD: ESCPL2,PRPXL24,BDC,D4;
MDL: LX-300+;
CLS: PRINTER;
DES: EPSON[SP]LX-300+;
LX-300+
n
When IEEE1284.4 is disabled;
[00H][4BH]
MFG: EPSON;
CMD: ESCPL2,PRPXL24,BDC;
MDL: LX-300+;
CLS: PRINTER;
DES: EPSON[SP]LX-1170;
LX-300+
PRODUCT DESCRIPTION
IEEE-1284 nibble mode
See 1.3.1 "Parallel Interface (Forward Channel)"
Refer to the IEEE-1284 specification
Refer to the IEEE-1284 specification
IEEE-1284 level 1 device
Refer to the IEEE-1284 specification
The printer responds to the extensibility request
[00H][4EH]
MFG: EPSON;
CMD: ESCP9,PRPII9,BDC,D4;
MDL: LX-1170;
CLS: PRINTER;
DES: EPSON[SP]LX-1170;
LX-1170
[00H][4BH]
MFG: EPSON;
CMD: ESCP9,PRPII9,BDC;
MDL: LX-1170;
CLS: PRINTER;
DES: EPSON[SP]LX-1170;
LX-1170
Table 1-13. Connector Pin Assignment and Signals (Reverse Channel)
Pin No. Signal Name
1 HostClk
2 DATA1
3 DATA2
4 DATA3
5 DATA4
6 DATA5
7 DATA6
8 DATA7
9 DATA8
10 PtrClk
PtrBusy/DataBit-
11
3,7
AckDataReq/
12
DataBit-2,6
Xflag/
13
DataBit-1,5
14 HostBusy
31 -INIT
-DataAvail/
32
DataBit-0,4
36 1284-Active
18 Logic-H
35 +5V
Interface Specifications
Return
GND In/Out Functional Description
Pin
19 In Host clock signal.
Parallel input data to the printer.
20 In
21 In
22 In
23 In
24 In
25 In
26 In
27 In
28 Out Printer clock signal.
Printer busy signal and reverse channel
29 Out
transfer data bit 3 or 7.
Acknowledge data request signal and
28 Out
reverse channel transfer data bit 2 or 6.
X-flag signal and reverse channel
28 Out
transfer data bit 1 or 5.
30 In Host busy signal.
30 In Not used.
Data available signal and reverse channel
29 Out
transfer data bit 0 or 4.
30 In 1284 active signal.
This line is pulled up to +5V through 3.9
-- Out
kΩ resister.
This line is pulled up tp +5V through 1.0
-- Out
kΩ resister.
Revision C
bit0:LSB
bit1
bit2
bit3
bit4
bit5
bit6
bit7:MSB
23