Usb Interface - Epson DFX-9000 Service Manual

Epson DFX-9000

1.2.8.4 USB Interface

Specifications
Universal Serial Bus Specifications Revision 1.1
Universal Serial Bus Device Class Definition for Printing Devices
Version 1.1
Bit rate: 12 Mbps (Full Speed Device)
Data encording: NRZI
Connector: USB Series B
Max. cable length: 2 meters
Connector pin assignment and signals:
Table 1-23. Connector pin assignment
Pin Signal
In/Out
No. name
1 VCC -
2 –Data Bi-directional
3 +Data Bi-directional
4 Ground -
Product Description
Function description
This line is for cable power.
Maximum power consumption is
100 mA.
This line is for data.
This line is for data and is pulled
up to +3.3 V via a 1.5 kΩ resistor.
This line is for cable ground.
Basic specifications
Pin #2
Pin #3
Figure 1-20. USB interface connector pin assignment
The USB responds to a BULK OUT transaction with a NAK handshake
and other transactions with ACK under the following conditions:
In SelecType mode
During a cover open error
During a paper jam error
During a ribbon jam error
During a ribbon out error
During a paper-out error
During an incomplete paper change error
The USB responds to a BULK OUT transaction with NAK and BULK
IN transaction with NAK under the following conditions:
When the input buffer is full
During hardware initialization
In the self test mode
In the adjustment mode
When there is a printer hardware error (fatal error), the USB responds to
a BULK OUT or BULK IN transaction with STALL.
Revision B
Pin #1
Pin #4
30