Rev. 1.01
- 12 -
SRP-275III
2-2-2 Parallel Interface (IEEE1284) + USB : OP Model
Interface connector
USB
Drawer kick-
out
Connector
• Parallel
Pin no.
Source
Compatibility mode
Nibble mode
Byte mode
1
Host
nStrobe
HostClk
HostClk
2
Host / Printer
Data 0 (LSB)
-
Data 0 (LSB)
3
Host / Printer
Data 1
-
Data 1
4
Host / Printer
Data 2
-
Data 2
5
Host / Printer
Data 3
-
Data 3
6
Host / Printer
Data 4
-
Data 4
7
Host / Printer
Data 5
-
Data 5
8
Host / Printer
Data 6
-
Data 6
9
Host / Printer
Data 7 (MSB)
-
Data 7 (MSB)
10
Printer
nAck
PtrClk
PtrClk
11
Printer
Busy
PtrBusy / Data3,7
PtrBusy
12
Printer
Perror
AckDataReq / Data2,6
AckDataReq
13
Printer
Select
Xflag / Data1,5
Xflag
14
Host
nAutoFd
HostBusy
HostBusy
15
-
NC
ND
ND
16
-
GND
GND
GND
17
-
GND
FG
FG
18
Printer
Logic-H
Logic-H
Logic-H
19~30
-
GND
GND
GND
31
Host
nInit
nInit
nInit
32
Printer
nFault
nDataAbail /
nDataAvail
33
-
NC
ND
ND
34
Printer
NC
ND
ND
35
Printer
NC
ND
ND
36
Host
nSelectln
1284-Active
1284-Active
• USB
Pin No.
Signal name
Assignment (Color)
Function
Shell
Shield
Drain wire
Frame ground
1
VBUS
Red
NC
2
D-
White
Differential data line
3
D+
Green
Differential data line
4
GND
Black
Signal ground