Usb Interface - Epson 890N - FX B/W Dot-matrix Printer Service Manual

EPSON FX-890/2190
Table 1-27. Connector pin assignment (Reverse channel)
Return
IN/
Pin No. Signal Name GND
Out*
Pin
1 HostClk 19 In
2 DATA1 20 In
3 DATA2 21 In
4 DATA3 22 In
5 DATA4 23 In
6 DATA5 24 In
7 DATA6 25 In
8 DATA7 26 In
9 DATA8 27 In
10 PtrClk 28 Out
PtrBusy /
11 29 Out
DataBit-3,7
AckDataReq /
12 28 Out
DataBit-2,6
Xflag /
13 28 Out
DataBit-1,5
14 HostBusy 30 In
31 -INIT 30 In
-DataAvail /
32 29 Out
DataBit-0,4
36 1284-Active 30 In
18 Logic-H - Out
35 +5 V - Out
17 Chassis - -
16, 33
GND - -
19-30
15, 34 NC - -
Note : In/Out refers to the direction of signal flow from the printer's point of view.
PRODUCT DESCRIPTIONS
Function description
Host clock signal.
Parallel input data to the printer. bit 0: LSB
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7: MSB
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 used.
Data Available signal and reverse channel transfer
data bit 0 or 4.
1284 active signal.
This line is pulled up to +5 V through 3.9 kΩ
resistor.
This line is pulled up to +5 V through 1.0 kΩ
resistor.
Chassis GND.
Signal GND.
Not connected.

1.2.3 USB Interface

Specifications
Standard:
Bit rate :
Data encording :
Adaptable connector :
Recommended cable length : 2 meters
Connector pin assignment and signals :
Table 1-28. Connector pin assignment
Pin No. Signal name In/Out
1 VCC
2 -Data Bi-directional Data
Bi-directional Data, pull up to +3.3V via 1.5K Ω resistor
3 +Data
4 Ground
Figure 1-8. USB Interface connector pin assignment
Interface
Based on
"Universal Serial Bus Specifications
Revision 1.1"
"Universal Serial Bus Device Class
Definition for Printing Devices Version 1.1"
12 Mbps (Full Speed Device)
NRZI
USB Series B
Function description
Cable power. Maximum power consumption is
-
100mA
- Cable ground
Pin #2 Pin #1
Pin #3
Pin #4
Revision B
26