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EPSON Stylus PHOTO 810/820/830 Revision B
PRODUCT DESCRIPTION INTERFACE 20
1.3.2 Parallel Interface (Reserve Channel)
Transmission Mode : IEEE-1284 nibble mode
Adaptable Connector : See forward channel
Synchronization : Refer to the IEEE-1284 specification
Handshaking : Refer to the IEEE-1284 specification
Data Trans. Timing : Refer to the IEEE-1284 specification
Signal Level : IEEE-1284 level 1 device
See forward channel.
NOTE:
In/Out refers to the direction of signal flow from the printer’s point of
view.
Extensibility Request:
The printer responds affirmatively when the extensibility request values are 00H
or 04H, that means,
00H : Request nibble mode reverse channel transfer.
04H : Request device ID;
Return data using nibble mode rev channel transfer.
Table 1-14. Connector pin assignment and signals
Pin No. Signal name
Return
GND pin
In/Out Functional description
1 HostClk 19 In Host clock signal.
2 DATA0 20 In
The DATA0 through DATA7 signals
represent data bits 0 to 7, respectively.
Each signal is at high level when data is
logical 1 and low level when data is
logical 0.
These signals are used to transfer the
1284 extensibility request values to the
printer.
3 DATA1 21 In
4 DATA2 22 In
5 DATA3 23 In
6 DATA4 24 In
7 DATA5 25 In
8 DATA6 26 In
9 DATA7 27 In
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 Pulled up to +5V via 3.9K ohm resistor.
35 +5V - Out Pulled up to +5V via 3.3K ohm resistor.
17 Chassis GND - - Chassis GND.
16,33,
19-30
GND - - Signal GND.
15,34 NC - - Not connected.
Table 1-14. Connector pin assignment and signals (continued)
Pin No. Signal name
Return
GND pin
In/Out Functional description