Ecp Mode - Epson Stylus PRO 7500 Service Manual

EPSON Stylus Pro 7500
Table 1-16. Parallel Interface-Nibble Mode
Pin Return In/
Signal Name
No. Pin Out
1 HostClk 19 I
2-9 Data1-8 20-27 I
10 PtrClk 28 O
PtrBusy/
11 29 O
DataBit-3,7
AckDataReq/
12 28 O
DataBit-2,6
Xflag/DataBit-
13 28 O
1,5
14 HostBusy 30 I
31 -INIT 30 I
-DataAvail/
32 29 O
DataBit-0,4
36 1284-Active 30 I
18 Logic-H ---- O
35 +5V ---- O
17 Chassis GND ---- ----
16,33,
GND ---- ----
9-30
15,34 NC ---- ----
NOTE: In (I) and Out (O) refer to the dirction of signal flow from the printer's
point of view.
Product Description
Functional Description
Host side clock signal.
Data signal
Printer side clock signal
Printer side BUSY signal and data bit 3 or data bit
7 in the reverse channel.
ACK data request signal and data bit 2 or 6 in the
reverse channel.
Xflag signal and data bit 1 or 5 in the reverse
channel.
Host side BUSY signal.
Not used.
Data available signal and data bit 0 or 4 in the
reverse channel.
1284 Active signal.
Normally High Level 3.9 K ohms, pulled up to 5
V.
Normally High Level 1.0 K ohms, pulled up to 5
V.
Printer chassis ground.
GND for twisted pair return.
Not used.

ECP MODE

o
Data Transfer Format:
o
Synchronization System:
o
Handshake:
o
Logic level:
o
Data transfer timing:
o
Expansion Request Data:
o
Device ID:
o
See the table below for the signal layout and signal names.
Interfaces
IEEE-1284 ECP Mode
Compatible with IEEE-1284 Specifications
Compatible with IEEE-1284 Specifications
TTL level (IEE-P1284 Level 1 device)
Compatible with IEEE-1284 Specifications
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.
[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>
Revision A
27