Type-B Optional Interface; Buffer Operation - Epson Stylus Pro 9000 Service Manual

EPSON Stylus Pro 9000
Table 1-31. Connector Pin Assignments - Reverse Channel
Pin Return In/
Signal Name
No. Pin Out
1 HostClk 19 I
2-9 Data0-7 20-27 I
10 PeriphClk 28 O
PeriphAck/
11 29 O
PtrBusy
12 AckData Req 28 O
13 Xflag 28 O
14 HostBusy 30 I
15 NC
16 GND
17 Chassis GND
18 Logic-H O
19-30 GND
31 /INIT 30 I
32 /DataAvail 29 O
33 GND
34 NC
35 +5V ---- O
36 1284-Active 30 I
Product Description
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. These
signals are used to transfer the 1284
extensibility request values to the printer.
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.
Ground for twisted pair return
Not connected
Pulled up to +5V via 3.3K ohm resister.
1284 Active Signal

TYPE-B OPTIONAL INTERFACE

The EPSON Stylus Pro 9000 supports a Type-B interface (level 2).
Reply message (short version):
n
When using Co-ax/Twin-ax interface card:
Main type: MTP48p, PW127cl10cpi, PRG (KAxxxx)rev,
AP1200ma
Product name: Stylus[SP]Pro[SP]9000
Emulation type: ESCPL2-00
Entity type: EPSONLQ2
n
When not using a different (not Co-ax/Twin-ax) interface card:
Main type: MTP48p, PW127cl10cpi, PRG (KAxxx)rev,
AP1200ma, SPD0fast
Product name: Stylus[SP]Pro[SP]9000
Emulation type: ESCPL2-00
Entity type: ESPONLQ2

BUFFER OPERATION

When there is no space left in the buffer (4Kb or less), the EPSON Stylus Pro
9000 sends the host a BUSY signal. If the host receives this signal for a long
time, it times out and stops sending data.
Interfaces
Revision B
31