Reverse Channel - Epson Stylus Pro XL Service Manual

Product Description

1.3.1.2 Reverse Channel

Transmission mode:
Synchronization:
Handshaking:
Signal level:
Adaptable connector:
Data transmission timing:
Table 1-3 shows connector pin assignments and signal functions of the 8-bit parallel interface for reverse
channel.
Table 1-3. Signal and Connector Pin Assignments for the Parallel Interface
Pin No. Signal Name
1 Host Clk
2 - 9 DATA 0 - 7
10 Ptr Clk
Ptr Busy / Data
11
Bit 3, 7
Ack Data Req /
12
Data Bit 2, 6
Xflag / Data Bit
13
1, 5
14 Host Busy
31 INIT
Data Avail / Data
32
Bit 0, 4
36 1284-Active
18 Logic-H
35 +5V
17 Chassis GND
16, 33,
GND
19 - 30
15, 34 NC
* : The I/O column indicates the direction of the signal as viewed from the printer.
1-6
8-bit parallel, IEEE-1284 nibble mode.
Refer to the IEEE-1284 specification.
Refer to the IEEE-1284 specification.
IEEE-1284 level 1 device (See the forward channel.)
The same as for the forward channel.
Refer to the IEEE-1284 specification.
(Reverse Channel)
Return
I/O*
GND Pin
19 I Host clock signal.
DATA 0-7 signals represent data bits 0 - 7,
respectively. Each signal is at a HIGH level when data
20 - 27 I 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.
28 O Printer clock signal.
Printer busy signal and reverse channel transfer data
29 O
bits 3, 7.
Acknowledge data request signal and reverse channel
28 O
transfer data bits 2, 6.
X-flag signal and reverse channel transfer data bits
28 O
1, 5.
30 I Host busy signal.
30 I Not used.
Data available signal and reverse channel transfer
29 O
data bits 0, 4.
30 I 1284 active signal.
A HIGH signal indicates that all other signals sourced
— O
by the peripheral are in valid status.
— O Pulled up to +5 V via 3.3K
— — Chassis GND.
— — Signal GND.
— — Not connected.
Stylus Pro XL+
Description
resistor.
Rev.A