Parallel Interface (Reverse Channel) - Epson Stylus PHOTO 2000P Service Manual

EPSON Stylus PHOTO 2000P

1.3.1.2 Parallel Interface (Reverse 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
Table 1-9. Connector pin assignment and signals
Return
Pin
Signal Name GND
No.
Pin
1 HostClk 19
2 DATA0 20
3 DATA1 21
4 DATA2 22
5 DATA3 23
6 DATA4 24
7 DATA5 25
8 DATA6 26
9 DATA7 27
10 PtrClk 28
11 PtrBusy / 29
DataBit-3,7
Product Descriptions
In/
Functional description
Out*
In Host clock signal.
In The DATA0 through DATA7 signals
represent data bits 0 to 7,
In respectively.
In Each signal is at high level when data
is logical 1 and low level when
In data is logical 0.
In These signals are used to transfer the
1284 extensibility request values
In to the printer.
In
In
Out Printer clock signal.
Out Printer busy signal and reverse
channel transfer data bit 3 or 7.
Table 1-9. Connector pin assignment and signals
Return
Pin
Signal Name GND
No.
12 AckDataReq /
DataBit-2,6
13 Xflag /
DataBit-1,5
14 HostBusy
31 -INIT
32 -DataAvail /
DataBit-0,4
36 1284-Active
18 Logic-H
35 +5V
17 Chassis GND
16, 33 GND
19-30
15, 34 NC
NOTE: In/Out refers to the direction of signal flow seen from the printer side.
Interface
In/
Functional description
Out*
Pin
28 Out Acknowledge data request signal and
reverse channel transfer data bit 2 or
6.
28 Out X-flag signal and reverse channel
transfer data bit 1 or 5.
30 In Host busy signal.
30 In Not used.
29 Out Data available signal and reverse
channel transfer data bit 0 or 4.
30 In 1284 active signal.
- Out Pulled up to +5 V via 3.9 K ohm
resistor.
- Out Pulled up to +5 V via 3.3 K ohm
resistor.
- - Chassis GND.
- - Signal GND.
- - Not connected.
Revision A
18