Epson Stylus Pro 7500 - Page 28

EPSON Stylus Pro 7500 Revision A
Product Description Interfaces 28
NOTE: If it is active in the Low state, a ” /” is included with the signal name.
Table 1-17. Parallel Interface (ECP Mode)
Pin
No.
Signal
Name
Return
Pin
Source Function
1HostClk19
Center
Machin
e
Transfers data or address information from the
host to the printer.
2 DATA1 20
Center
Machin
e
Each signal indicates parallel data information
from the first bit to the 8th bit. “HIGH” is shown
by a “1” in the data and “LOW” is shown by a “0”
in the data. These show the address from the host
to the printer or from printer to the host, or data.
3 DATA2 21
Center
Machin
e
4 DATA3 22
Center
Machin
e
5 DATA4 23
Center
Machin
e
6 DATA5 24
Center
Machin
e
7 DATA6 25
Center
Machin
e
8 DATA7 26
Center
Machin
e
9 DATA8 27
Center
Machin
e
10 PeriphClk 28 Printer Transfers data from the printer to the host.
11 PeriphAck 29 Printer
The printer uses this signal for forward direction
flow control. Also, this signal offers data bit 9,
used in judging whether the information output in
the reverse direction data signals contains
command information or data information.
12
nAckRever
se
28 Printer
Drives the printer in the Low state and approves
nReverseRequest.
13 Xflag 28 Printer
X-flag signal and data bit 1 or data bit 5 in the
reverse channel.
14 HostAck 30
Center
Machin
e
The printer uses this signal for reverse direction
flow control. Also, this signal offers data bit 9,
used in judging whether the information output in
the forward direction data signals contains
command information or data information.
31
nReverseR
equest
30
Center
Machin
e
Sets this signal “LOW” to switch the channel to
the reverse direction.
32
nPeriphRe
quest
29 Printer This signal is used for generating host interrupts.
18
PeriphLogi
c H
29 Printer
Normally High Level 3.9 K ohms, pulled up to 5
V.
35 +5V ---- Printer
Normally High Level 1.0 K ohms, pulled up to 5
V.
17 Chassis ---- O Printer chassis ground.
16,33,
19-30
GND ---- ---- Ground for twisted pair return.
15,34 NC ---- ---- Not used.
36
1284-
Active
30
Center
Machin
e
1284 active signal. “HIGH” while in the ECP
mode.
Table 1-17. Parallel Interface (ECP Mode)
Pin
No.
Signal
Name
Return
Pin
Source Function