Parallel Interface - Nibble Mode - Epson Stylus PRO Color Large Format Inkjet Printer 7000 Service Manual

EPSON Stylus Pro 7000

1.2.2 Parallel Interface - Nibble Mode

Table 1-17. Transmission Specifications
Transmission mode IEEE-1284 nibble mode
Synchronization Refer to IEEE-1284 specification
Handshaking Refer to IEEE-1284 specification
Signal level TTL compatible (IEEE-1284 level 1 device)
Adaptable
57-30360 (Amphenol) or equivalent
connector
Data trans. timing Refer to IEEE-1284 specification
The printer responds affirmatively when the extensibility
request values are 00H or 04H:
00H: Request Nibble Mode Reverse Channel Transfer
Extensibility request
04H: Request Device ID;
Return Data Using Nibble Mode Reverse Channel
Transfer
The printer returns the following strings when the device ID
is requested:
<00H><4EH>
MFG: EPSON
CMD: ESCPL2, BDC
Device ID
MDL: Stylus[SP]Pro[SP]7000
CLS: PRINTER
DES: EPSON[SP]Stylus[SP]Pro{SP]7000
Note: [00H] denotes a hexadecimal value of zero
MDL values depend on the EEPROM setting
Product Description
Description
Interfaces
Table 1-18. Connector Pin Assignments - Reverse Channel
Pin Return In/
Signal Name
No. Pin Out
HostClk
1 19 I
2-9 Data0-7 20-27 I
PtrClk
10 28 O
PtrBusy/
11 29 O
DataBit-3,7
AckDataReq/
12 28 O
DataBit-2,6
Xflag/
13 28 O
DataBit-1,5
HostBusy
14 30 I
15 NC
16 GND
Chassis GND
17
Logic-H
18 O
GND
19-30
-INIT
31 30 I
-DataAvail/
32 29 O
DataBit-0,4
GND
33
34 NC
35 +5V ---- O
1284-Active
36 30 I
Note: In (I) and Out (O) refer to the direction of signal flow from the printer's point
of view.
Revision B
Functional Description
Host clock signal.
The DATA0 through DATA7 signals
represent data bits 0 to7, respectively.
Each signal is at high level when data is
logical 1 and low level when data is logical
0.
Printer clock signal
Printer busy signal and reverse channel
transfer data bit 3 or 7.
Acknowledge data request signal and
reverse channel transfer data bit 2 or 6.
X-flag signal and reverse channel transfer
data bit 1 or 5.
Host busy signal.
Not connected
Signal ground
Chassis ground
Pulled up to +5V via 3.9K ohm resister.
Ground for twisted pair return
Not used.
Data available signal and reverse channel
transfer data bit 0 or 4.
Signal ground
Not connected
Pulled up to +5V via 1.0K ohm resister.
1284 Active Signal
26