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EPSON Stylus Pro 7000 Revision B
Product Description Interfaces 26
1.2.2 Parallel Interface - Nibble Mode
Note: In (I) and Out (O) refer to the direction of signal flow from the printer’s point
of view.
Table 1-17. Transmission Specifications
Description
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
connector
57-30360 (Amphenol) or equivalent
Data trans. timing Refer to IEEE-1284 specification
Extensibility request
The printer responds affirmatively when the extensibility
request values are 00H or 04H:
00H: Request Nibble Mode Reverse Channel Transfer
04H: Request Device ID;
Return Data Using Nibble Mode Reverse Channel
Transfer
Device ID
The printer returns the following strings when the device ID
is requested:
<00H><4EH>
MFG: EPSON
CMD: ESCPL2, BDC
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
Table 1-18. Connector Pin Assignments - Reverse Channel
Pin
No.
Signal Name
Return
Pin
In/
Out
Functional Description
1
HostClk
19 I
Host clock signal.
2-9
Data0-7
20-27 I
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.
10
PtrClk
28 O
Printer clock signal
11
PtrBusy/
DataBit-3,7
29 O
Printer busy signal and reverse channel
transfer data bit 3 or 7.
12
AckDataReq/
DataBit-2,6
28 O
Acknowledge data request signal and
reverse channel transfer data bit 2 or 6.
13
Xflag/
DataBit-1,5
28 O
X-flag signal and reverse channel transfer
data bit 1 or 5.
14
HostBusy
30 I
Host busy signal.
15
NC Not connected
16
GND Signal ground
17
Chassis GND Chassis ground
18
Logic-H
O
Pulled up to +5V via 3.9K ohm resister.
19-30
GND Ground for twisted pair return
31
-INIT
30 I
Not used.
32
-DataAvail/
DataBit-0,4
29 O
Data available signal and reverse channel
transfer data bit 0 or 4.
33
GND Signal ground
34
NC Not connected
35
+5V
---- O
Pulled up to +5V via 1.0K ohm resister.
36
1284-Active
30 I
1284 Active Signal