Epson Stylus Pro 7500, Service Manual

Page: 27 / 274

EPSON Stylus Pro 7500 Revision A
Product Description Interfaces 27
NOTE: In (I) and Out (O) refer to the dirction of signal flow from the printer’s
point of view.
ECP MODE
o
Data Transfer Format: IEEE-1284 ECP Mode
o
Synchronization System: Compatible with IEEE-1284 Specifications
o
Handshake: Compatible with IEEE-1284 Specifications
o
Logic level: TTL level (IEE-P1284 Level 1 device)
o
Data transfer timing: Compatible with IEEE-1284 Specifications
o
Expansion Request Data: If the expansion request data value is 10H or 14H,
the request is received. The meanings of these
values are as shown below.
10H:Request to carry out transfers in the ECP
mode.
14H:Request to return the ID of the device using
the ECP mode.
o
Device ID: [00H] [47H]
MFG: EPSON
CMD: ESCPL2, BDC;
MDL:Stylus [SP] Pro [SP] 7500
CLS: PRINTER
DES: EPSON [SP] Stylus [SP] Pro [SP] 7500;
*: [SP] is code 20<H>
o
See the table below for the signal layout and signal names.
Table 1-16. Parallel Interface-Nibble Mode
Pin
No.
Signal Name
Return
Pin
In/
Out
Functional Description
1 HostClk 19 I Host side clock signal.
2-9 Data1-8 20-27 I Data signal
10 PtrClk 28 O Printer side clock signal
11
PtrBusy/
DataBit-3,7
29 O
Printer side BUSY signal and data bit 3 or data bit
7 in the reverse channel.
12
AckDataReq/
DataBit-2,6
28 O
ACK data request signal and data bit 2 or 6 in the
reverse channel.
13
Xflag/DataBit-
1,5
28 O
Xflag signal and data bit 1 or 5 in the reverse
channel.
14 HostBusy 30 I Host side BUSY signal.
31 -INIT 30 I Not used.
32
-DataAvail/
DataBit-0,4
29 O
Data available signal and data bit 0 or 4 in the
reverse channel.
36 1284-Active 30 I 1284 Active signal.
18 Logic-H ---- O
Normally High Level 3.9 K ohms, pulled up to 5
V.
35 +5V ---- O
Normally High Level 1.0 K ohms, pulled up to 5
V.
17 Chassis GND ---- ---- Printer chassis ground.
16,33,
9-30
GND ---- ---- GND for twisted pair return.
15,34 NC ---- ---- Not used.