Service manual

LX-300+ Revision A
Product Description Interface Specifications 21
1.3.2 Parallel Interface (Reverse Channel)

Transmission mode: IEEE-1284 nibble mode

Adaptable connector: See 1.3.1 "Parallel Interface (Forward
Channel)"

Synchronization: Refer to the IEEE-1284 specification
 Handshaking: Refer to the IEEE-1284 specification
 Signal level: IEEE-1284 level 1 device
See 1.3.1 "Parallel Interface (Forward Channel)"
 Data transmission timing: Refer to the IEEE-1284 specification
 Extensibility request: The printer responds to the 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
 Device ID: The printer sends following device ID string when it is
requested.
 When IEEE1284.4 is enabled;
 When IEEE1284.4 is disabled;
Table 1-13.
[00H][4EH]
MFG: EPSON;
CMD: ESCPL2,PRPXL24,BDC,D4;
MDL: LX-300+;
CLS: PRINTER;
DES: EPSON[SP]LX-300+;
Table 1-14.
[00H][4BH]
MFG: EPSON;
CMD: ESCPL2,PRPXL24,BDC;
MDL: LX-300+;
CLS: PRINTER;
DES: EPSON[SP]LX-300+;
Table 1-15. Connector Pin Assignment and Signals
Pin
No.
Signal Name
Return
GND
Pin
In/Out Functional Description
1 HostClk 19 In Host clock signal.
2 DATA1 20 In
Parallel input data to the printer.
bit0:LSB
3 DATA2 21 In bit1
4 DATA3 22 In bit2
5 DATA4 23 In bit3
6 DATA5 24 In bit4
7 DATA6 25 In bit5
8 DATA7 26 In bit6
9 DATA8 27 In bit7:MSB
10 PtrClk 28 Out Printer clock signal.
11
PtrBusy/
DataBit-3,7
29 Out
Printer busy signal and reverse
channel transfer data bit 3 or 7.
12
AckDataReq/
DataBit-2,6
28 Out
Acknowledge data request signal
and reverse channel transfer data
bit 2 or 6.
13
Xflag/
DataBit-1,5
28 Out
X-flag signal and reverse channel
transfer data bit 1 or 5.
14 HostBusy 30 In Host busy signal.
31 -INIT 30 In Not used.
32
-DataAvail/
DataBit-0,4
29 Out
Data available signal and reverse
channel transfer data bit 0 or 4.
36 1284-Active 30 In 1284 active signal.
18 Logic-H -- Out
This line is pulled up to +5V
through 3.9 k
Ω
resister.