Parallel Interface (Reserve Channel) - Epson Stylus C50 Service Manual

EPSON Stylus C50/C60/C61/C62
Table 1-13. Connector pin assignment and signals (continued)
Return
Pin No. Signal name
GND pin
35 +5V -
17 Chassis GND -
16,33,
GND -
19-30
15,34 NC -
NOTE: In/Out refers to the direction of signal flow from the printer's point of
view.
PRODUCT DESCRIPTION
In/Out Functional description
Out Pulled up to +5V via 3.3K ohm resistor.
- Chassis GND.
- Signal GND.
- Not connected.

1.3.2 Parallel Interface (Reserve Channel)

Transmission mode
Adaptable connector
Synchronization
Handshaking
Data trans. timing
Signal level
Table 1-14. Connector pin assignment and signals
Pin No. Signal name
1 HostClk
2 DATA0
3 DATA1
4 DATA2
5 DATA3
6 DATA4
7 DATA5
8 DATA6
9 DATA7
10 PtrClk
PtrBusy /
11
DataBit-3,7
AckDataReq
12
/ DataBit-2,6
Xflag /
13
DataBit-1,5
14 HostBusy
INTERFACE
: IEEE-1284 nibble mode
: See forward channel
: Refer to the IEEE-1284 specification
: Refer to the IEEE-1284 specification
: Refer to the IEEE-1284 specification
: IEEE-1284 level 1 device
See forward channel
Return
In/Out Functional description
GND pin
19 In Host clock signal.
20 In
21 In
The DATA0 through DATA7 signals
represent data bits 0 to 7, respectively.
22 In
Each signal is at high level when data is
23 In
logical 1 and low level when data is
logical 0.
24 In
These signals are used to transfer the
25 In
1284 extensibility request values to the
printer.
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.
Revision C
18