Epson 890N Service Manual - Page 26

USB Interface, USB Interface connector pin assignment, Table 1-27.

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EPSON FX-890/2190 Table 1-27. Connector pin assignment (Reverse channel) Pin No. Signal Name Return GND Pin IN/ Out* Function description 1 HostClk 19 In Host clock signal. 2 DATA1 20 In Parallel input data to the printer. bit 0: LSB 3 DATA2 21 In bit 1 4 DATA3 22 In bit 2 5 DATA4 23 In bit 3 6 DATA5 24 In bit 4 7 DATA6 25 In bit 5 8 DATA7 26 In bit 6 9 DATA8 27 In bit 7: MSB 10 PtrClk 28 Out Printer clock signal. 11 PtrBusy / DataBit-3,7 29 Out Printer busy signal and reverse channel transfer data bit 3 or 7. 12 AckDataReq / DataBit-2,6 28 Out Acknowledge data request signal and reverse channel transfer data bit 2 or 6. 13 Xflag / DataBit-1,5 28 Out X-flag signal and reverse channel transfer data bit 1 or 5. 14 HostBusy 30 In Host Busy signal. 31 -INIT 30 In Not used. 32 -DataAvail / DataBit-0,4 29 Out Data Available signal and reverse channel transfer data bit 0 or 4. 36 1284-Active 30 In 1284 active signal. 18 Logic-H - Out This line is pulled up to +5 V through 3.9 kΩ resistor. 35 +5 V - Out This line is pulled up to +5 V through 1.0 kΩ resistor. 17 Chassis - - Chassis GND. 16, 33 19-30 GND - - Signal GND. 15, 34 NC - - Not connected. Note : In/Out refers to the direction of signal flow from the printer's point of view. Revision B 1.2.3 USB Interface † Specifications „ Standard: Based on "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 „ Adaptable connector : USB Series B „ Recommended cable length : 2 meters † Connector pin assignment and signals : Table 1-28. Connector pin assignment Pin No. Signal name 1 VCC In/Out - Function description Cable power. Maximum power consumption is 100mA 2 -Data Bi-directional Data 3 +Data Bi-directional Data, pull up to +3.3V via 1.5K Ω resistor 4 Ground - Cable ground Pin #2 Pin #1 Pin #3 Pin #4 Figure 1-8. USB Interface connector pin assignment PRODUCT DESCRIPTIONS Interface 26

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EPSON FX-890/2190
Revision B
PRODUCT DESCRIPTIONS
Interface
26
Note : In/Out refers to the direction of signal flow from the printer’s point of view.
1.2.3
USB Interface
Specifications
Standard:
Based on
“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
Adaptable connector :
USB Series B
Recommended cable length :
2 meters
Connector pin assignment and signals :
Figure 1-8.
USB Interface connector pin assignment
Table 1-27.
Connector pin assignment (Reverse channel)
Pin No.
Signal Name
Return
GND
Pin
IN/
Out*
Function description
1
HostClk
19
In
Host clock signal.
2
DATA1
20
In
Parallel input data to the printer.
bit 0: LSB
3
DATA2
21
In
bit 1
4
DATA3
22
In
bit 2
5
DATA4
23
In
bit 3
6
DATA5
24
In
bit 4
7
DATA6
25
In
bit 5
8
DATA7
26
In
bit 6
9
DATA8
27
In
bit 7: MSB
10
PtrClk
28
Out
Printer clock signal.
11
PtrBusy /
DataBit-3,7
29
Out
Printer busy signal and reverse channel transfer
data bit 3 or 7.
12
AckDataReq /
DataBit-2,6
28
Out
Acknowledge data request signal and reverse
channel transfer data bit 2 or 6.
13
Xflag /
DataBit-1,5
28
Out
X-flag signal and reverse channel
transfer data bit 1 or 5.
14
HostBusy
30
In
Host Busy signal.
31
-INIT
30
In
Not used.
32
-DataAvail /
DataBit-0,4
29
Out
Data Available signal and reverse channel transfer
data bit 0 or 4.
36
1284-Active
30
In
1284 active signal.
18
Logic-H
-
Out
This line is pulled up to +5 V through 3.9 k
Ω
resistor.
35
+5 V
-
Out
This line is pulled up to +5 V through 1.0 k
Ω
resistor.
17
Chassis
-
-
Chassis GND.
16, 33
19-30
GND
-
-
Signal GND.
15, 34
NC
-
-
Not connected.
Table 1-28.
Connector pin assignment
Pin No.
Signal name
In/Out
Function description
1
VCC
-
Cable power. Maximum power consumption is
100mA
2
-Data
Bi-directional
Data
3
+Data
Bi-directional
Data, pull up to +3.3V via 1.5K
Ω
resistor
4
Ground
-
Cable ground
Pin #2
Pin #4
Pin #3
Pin #1